Answer:21 moles of PbCl2 formed
please help, I'm giving brainliest. Explain the term'wear acid'.
A 0.205 g sample of CaCO3 (Mr = 100.1 g/mol) is added to a flask along with 7.50 mL of 2.00 M HCl. CaCO3(aq) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)Enough water is then added to make a 125.0 mL solution.
The volume of the NaOH used is calculated as 14 mL.
What is stoichiometry?The term stoichiometry has to do with the calculation of the amount of substance in a reaction using mass - mole or mass - volume relationship.
Here;
Number of moles of CaCO3 = 0.205 g/100.1 = 0.00205 moles
Number of moles of HCl = 2.00 M * 7/1000 L = 0.014 moles
2 moles of HCl reacts with 1 mole of CaCO3
x moles of HCl reacts with 0.00205 moles of CaCO3
x = 0.00205 moles * 2/1 = 0.0041 moles
Hence HCl is the excess reactant
Amount of excess HCl = 0.014 moles - 0.0041 moles = 0.0099 moles
Concentration of excess HCl reacted = 0.0099 moles/125 * 10^-3 = 0.0792 M
Using;
CAVA/CBVB = NA/NB
CAVANB = CBVBNA
VB = CAVANB/CBNA
VB = 0.0792 M * 10 mL * 1/ 0.058 M
VB = 14 mL
Missing parts;
A 0.205 g sample of caco3 (mr = 100.1 g/mol) is added to a flask along with 7.50 ml of 2.00 m hcl. caco3(aq) + 2hcl(aq) → cacl2(aq) + h2o(l) + co2(g) enough water is then added to make a 125.0 ml solution. a 10.00 ml aliquot of this solution is taken and titrated with 0.058 m naoh. naoh(aq) + hcl(aq) → h2o(l) + nacl(aq) how many ml of naoh are used?
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What is the definition of spring scale?
The text above says that many acids taste sour, but also states that oranges and tomatoes contain acid. Suggest at least one reason why these fruits don't taste sour
Fruits don't taste sour because of less hydrogen ions and less acid.
Why these fruits taste sour?Scientists discovered that pulp from sour fruit contains more hydrogen ions, which leads sour taste while on the other hand, the sweeter fruit-like pineapples has pulp that contains fewer hydrogen ions, leading to less acidic and sweeter in taste.
So we can conclude that fruits don't taste sour because of less hydrogen ions and less acid.
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1. How many joules of heat are necessary to melt 500 g of ice at its freezing point?
Please show work!
Answer:
40 kcal
Explanation:
Heat required to melt
1 g
of ice at
0°C
is approximately
80 cal
. This is also called latent heat of fusion of ice.
For
500 g
of ice
Q
=
500
g
×
80
cal
g
=
40000 cal = 40 kcal
What properties of water are related to Oxidation?
Answer:
water has several important physical properties. Most of the physical properties of water are quite atypical e.g molar mass is 18.0151grams per mol and melting point is 0.00 degree
1. What is the relation between distance and speed?
a) distance= speed x time
b) distances speed / time
c) distance= time / speed
d) None of these
Answer:
option no b is right answer
Answer:
b
Explanation:
If 1.76 g of an ideal gas occupy 1.0 L at standard temperature and pressure (STP), what is the molar mass of the gas?
Answer:
Explanation:
Whenever you see molar masses in gas law questions, more often than not density will be involved. This question is no different. To solve this, however, we will first need to play with the combined ideal gas equation PV=nRT to make it work for density and molar mass. The derivation is simple but for the sake of time and space, I will skip it. Hence, just take my word for it that you will end up with the equation:M=dRTPM = molar mass (g/mol)d = density (g/L)R = Ideal Gas Constant (≈0.0821atm⋅Lmol⋅K) T = Temperature (In Kelvin) P = Pressure (atm)As an aside, note that because calculations with this equation involve molar mass, this is the only variation of the ideal gas law in which the identity of the gas plays a role in your calculations. Just something to take note of. Back to the problem: Now, looking back at what we're given, we will need to make some unit conversions to ensure everything matches the dimensions required by the equation:T=35oC+273.15= 308.15 KV=300mL⋅1000mL1L= 0.300 LP=789mmHg⋅1atm760mmHg= 1.038 atmSo, we have almost everything we need to simply plug into the equation. The last thing we need is density. How do we find density? Notice we're given the mass of the sample (0.622 g). All we need to do is divide this by volume, and we have density:d=0.622g0.300L= 2.073 g/LNow, we can plug in everything. When you punch the numbers into your calculator, however, make sure you use the stored values you got from the actual conversions, and not the rounded ones. This will help you ensure accuracy.M=dRTP=(2.073)(0.0821)(308.15)1.038= 51 g/molRounded to 2 significant figuresNow if you were asked to identify which element this is based on your calculation, your best bet would probably be Vandium (molar mass 50.94 g/mol). Hope that helped :)
Balance the equation
Before tackling this problem, be sure you know how to find the antilog of a number using a scientific calculator.
A solution has a pH of 5.4. Write the formula you will use to calculate the [H+] and then show all your work leading to the determination of [H+].
A solution has a pH of 5.4, the determination of [H+].
Given :- pH:- 5.4 pH = - log[H+]To find :- concentration of H+Answer:- Antilog(-5.4) or 4× 10-⁶Explanation:- Formula:- pH = -log H+Take negative to other side
-pH = log H+
multiple Antilog on both side
(Antilog and log cancel each other )
Antilog (-pH) = [ H+ ]
New Formula :- Antilog (-pH) = [+H]
Now put the values of pH in new formula
Antilog (-5.4) = [+H]
we can write -5.4 as (-6+0.6) just to solve Antilog
Antilog ( -6+0.6 ) = [+H]
Antilog (-6) × Antilog (0.6) = [+H]
[tex]Antilog (-6) = {10}^{ - 6} , \\ Antilog (0.6) = 4 [/tex]
put the value in equation
[tex] {10}^{ - 6} \times 4 = [H+] \\ 4 \times {10}^{ - 6} = [H+][/tex]
how many CO grans are produced from 1.80 mol of sulfur dioxide2
Answer:
A mol (approximately)represents the number 6.02 X 10^^23. Mols become useful when we learn that, for any element on the periodic table, 6.02 X 10^^23 atoms of that element have a mass equal to the atomic mass in grams. So, on the periodic table carbon has an atomic mass of 12.011. That means: 12.011 grams of carbon is made up of 6.02 X 10^^23 atoms.
The above question is tricky.
If the question considers 1 molecule of SO2 as a particle, then the answer is 1.80 * 6.02 X 10^^23
If the question considers the S as one particle, and the O2 as 2 more particles, then the answer is: 3 * 1.8 * 6.02 X 10^^23.
Explanation:
hope it helps U
How many full orbitals are in phosphorus
Answer:
three half-filled orbitals
Answer:
6p
Explanation:
It can hold a total of 6
state one possible mistake in a simple distillation setup and explain the significance of the mistake.
Answer:
liquid is heated. As the liquid is heated, the molecules within it gain the energy to escape the liquid phase and transition into the gas phase in the form of bubbles.
Explanation:
What are the processes that lead to the formation of sedimentary rocks? I WILL GIVE BRAINLIEST
A.weathering and erosion followed by dispersion.
B.volcanic eruptions followed by dispersion,
C. volcanic eruptions followed by compaction
D.weathering and erosion followed by compaction
Answer:
erosion, weathering, dissolution, precipitation, and lithification So,D.weathering and erosion followed by compaction
Explanation:
mark me brainliest!!
Why is an enzyme in a chemical reaction like a lock and key?
A. The active site and the substrate fit perfectly together, and when they do, they unlock the chemical reaction.
B. The non-reactive site and the substrate fit perfectly together, and when they do, they unlock the chemical reaction.
C. None of these
D. The nucleoid and Golgi Apparatus fit perfectly together, and when they do, they unlock the chemical reaction.
E. The active site and the cell membrane fit perfectly together, and when they do, they unlock the chemical reaction.
Answer:
A
Explanation:
the enzyme is substrate specifix coz of this trait
Calculate the pH of a hydrochloride acid solution, HCl, whose hydronium ion (H3O)+ concentration is 8.29 X 10-4 M.
Note: answer should have three significant figures
Answer:
Explanation:
Calculate the pH of a hydrochloride acid solution, HCl, whose hydronium ion (H3O)+ concentration is 8.29 X 10-4 M.
Note: answer should have three significant figures
Which property of liquids creates a meniscus in
glass tubes as seen in the picture?
O adhesion
O
cohesion
O melting point
polarity
ANSWER IS ADHESION
The property of liquid that create meniscus in glass tubes is Adhesion
What is Adhesion?Adhesion is the property of liquid in which two different or disimillar molecules or surfaces to cling to each other. For example, solids have a very high cohesive properties and this make them not to stick to the surfaces they come in contact.
Therefore, Adhesion property of liquids creates a meniscus in glass tube.
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Answer:
Adhesion
Explanation:
73.5 mol of P4O10 contains how many moles of P ? moles of P:
Answer:
294 moles of P
Explanation:
For every 1 mol of P4O10 contains 4 mol of P
so;
73.5 mol P4O10 × 4 mol P
1 mol P4O10
= 73.5 × 4
= 294 moles of P
73.5 mol of [tex]P_4O_{10}[/tex] contains 294 moles of P. In 1 mole of [tex]P_4O_{10}[/tex], there are 4 moles of P.
The International System of Units (SI) uses the mole (abbreviated as mol) as its basic unit to measure the amount of a substance. It is mostly used in chemistry and is defined as the volume of a substance that contains exactly 12 grammes of pure carbon-12 in terms of atoms (or equivalent amounts of molecules, ions, or particles). The fundamental notion that atoms combine in whole-number ratios to form compounds serves as the foundation for the concept of the mole. It makes it simple for scientists to convert between a substance's mass and the quantity of atoms or molecules it contains.
In 1 mole of [tex]P_4O_{10}[/tex], there are 4 moles of P.
=4 × 73.5 moles of P.
= 294 moles of P
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Choose all that apply for neap tides
Moon and sun are at right angles to the earth
Moon, sun, and earth are all in alignment
Smaller than normal range of highs and low tides
Gravity of the sun and moon work against each other
Answer:
1. Moon and sun are at right angles to the earth
2. Smaller than normal range of highs and low tides
3. Gravity of the sun and moon work against each other
write the formula for lead oxide.
Answer:
Lead(II) oxideExplanation:
Lead(II) oxide, also called lead monoxide, is the inorganic compound with the molecular formula PbO. PbO occurs in two polymorphs: litharge having a tetragonal crystal structure, and massicot having an orthorhombic crystal structure. Modern applications for PbO are mostly in lead-based industrial glass and industrial ceramics, including computer components. It is an amphoteric oxide.[3]IUPAC nameLead(II) oxideOther namesLead monoxideLithargeMassicotPlumbous oxideGalena PreparationPbO may be prepared by heating lead metal in air at approximately 600 °C (1,100 °F). At this temperature it is also the end product of oxidation of other oxides of lead in air:[4]Thermal decomposition of lead(II) nitrate or lead(II) carbonate also results in the formation of PbO:2 Pb(NO3)2 → 2 PbO + 4 NO2 + O2PbCO3 → PbO + CO2PbO is produced on a large scale as an intermediate product in refining raw lead ores into metallic lead. The usual lead ore is galena (lead(II) sulfide). At a temperature of around 1,000 °C (1,800 °F) the sulfide is converted to the oxide:[5]2 PbS + 3 O2 → 2 PbO + 2 SO2Metallic lead is obtained by reducing PbO with carbon monoxide at around 1,200 °C (2,200 °F):[6]PbO + CO → Pb + CO2pls brainlest meh
When barium nitrate solution is added to aqueous sulfurous acid a white precipitate forms what is the name of that white precipitate
Answer:
I expect it is barium sulfate
Explanation:
what would happen if you put vegetable oil and ice cubes into a beaker together? what would happen if you left it on the counter overnight?
What is the chemical name of the covalent compound SF6?
Answer:
The name of it is Sulfur Hexafluoride
Explanation:
Bonus fact: It is over 5 times heavier than air so when inhaling it, it makes your voice go very deep. The opposite of helium some would say
Amory turns the light on in her house. Looking at the lights, she begins to wonder how the charges are moving through the bulb. Which statement best describes how the charges move through the bulb ?
The statement 'when charges pass through the bulb, light is produced' best describes how the charges move through the bulb.
What is an electrical charge?An electrical charge is a type of positive or negative charge of the particles that move in a conductor.
At the atomic level, protons are positively charged particles, electrons are negative, and neutrons do not have a charge.
The electrical charges depend on the charge's initial time, the final time, and the net outward current.
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Suppose that a 10-mL sample of a solution is to be tested for I− ion by addition of 1 drop (0.2 mL) of 0.13 M Pb(NO3)2.
What is the minimum number of grams of I− that must be present in order for PbI2(s) ( Ksp=8.49×10−9 ) to form?
The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol
Given data :
Volume of solution to be tested for I-ion = 10 mL
Volume of Pb(NO₃)₂ = 0.2 mL
molarity of Pb(NO₃)₂ = 0.13 M
Determine the number of I that must be presentFirst step : calculate conc of PB²⁺ ions in the solution
conc of PB²⁺ ions = ( molarity of Pb(NO₃)₂ * volume of Pb(NO₃)₂ ) / ( total volume )
= ( 0.13 * 0.2 ) / ( 10 + 0.2 )
= ( 0.026 ) / ( 10.2 ) = 0.002549 M
Next step : determine the molarity of I
using the dissociation reaction of PbI₂
PbI₂(s) ---> Pb²⁺ (aq) + 2I (aq)
also; Ksp = [ Pb²⁺ ] [ I ]² ---- ( 1 )
From the question the given value of Ksp = 8.49 * 10⁻⁹
Therefore equation ( 1 ) becomes
8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²
[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )
= 0.0018 M
Final step : Determine the minimum number of grams of I
moles of I = molarity of I * total volume
= 0.0018 M * 10.2 mL
= 0.01836 * 10⁻³ mol
Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol
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Which statement describes a seismic wave during an earthquake?
A.
The wave changes directions as it is pulled by gravity.
B.
The wave changes speed as it moves through different materials.
C.
The wave loses energy to the oceans when it comes in contact with the water.
D.
The wave reflects off the surrounding rocks as it moves through the outer core.
Based on their nature of waves, seismic waves changes speed as it moves through different materials.
What are seismic waves?Seismic waves are the waves that are produced and travel through the earth crust during an earthquake.
Seismic waves are often described as elastic waves which is the energy caused by a sudden breaking of rock within the earth's crust.
Seismic waves can travel at different speeds through different types of rock, bouncing back or changing direction.
Therefore, the correct statement which describes a seismic wave during an earthquake is that the wave changes speed as it moves through different materials.
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one revolution of the moon around earth takes_______ days.
Answer:It’s important to know WHY. Great explanations are what makes Brainly awesomeExplain everything. Imagine that the person who was asking, knows nothing at all so you need to start from the very beginningAlways include the steps and/or background required to get to the final answer. Let’s help other people understand and solve future problems on their ownShow all the calculation if it is a numerical question.
Explanation:
Planck's constant, h, is 6.626 x 10-34 Js. The speed of light in a vacuum, c, is 3.00 x 108 m/s. Calculate the energy of ultraviolet light with a frequency of 9.58 x 1014 Hz. A) 1.45x1048 J B) 3.92x107 J C) 6.35x10-19 J D) 6.92x10-49 J
Given the Planck's constant and the speed of light, the energy of the ultraviolet light with a frequency of 9.58×10¹⁴ Hz is 6.35×10¯¹⁹ J (Option C)
Data obtained from the question Planck's constant (h) = 6.626×10¯³⁴ JsSpeed of light (v) = 3×10⁸ m/sFrequency (f) = 9.58×10¹⁴ HzEnergy (E) =? How to determine the energyThe energy of the ultraviolet light can be obtained as follow:
E = hf
E = 6.626×10¯³⁴ × 9.58×10¹⁴
E = 6.35×10¯¹⁹ J
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The ion with 86 electrons, 142 neutrons, and a 4+ charge
[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]
The ion had 4+ charge when it had 86 electrons, so it should have no charge on it if there are 4 more electrons and the atom will be neutral.
And since we know that number of electrons in a neutral atom is equal to Atomic Number of that atom.
So, at neutral phase, it had 86 + 4 = 90 electrons
hence, our required atom is : Thorium
And it's ion will be ~[tex]\sf Th^{4+} [/tex]
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How many grams does 5 helium atoms weigh?
Answer:
4.002602
Explanation:
the average that reflects the typical ratio of natural abundances of its isotopes.
The weight of 5 helium atoms in grams is 20.01301 grams.
What are atoms?Atoms are defined as the smallest unit into which matter can divided without the release of electrically charged particles.
It is also defined as a building block of matter and were discovered after big bang theory. It is a fundamental piece of matter.
The weight of 1 helium atom = 4.002602 g
So, the weight of 5 helium atom = 4.002602 x 5
= 20.01301 g
Thus, the weight of 5 helium atoms in grams is 20.01301 grams.
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