10/16/19

How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 42.1 moles of water vapor?
This is a really tough subject for me.
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10/15/19

Help! Chemistry Stoichiometry Question
I figured out how to balance this equation, and I think I figured out the answer to question number 1 for mass (I got 33.2 g of sodium carbonate), but how do you find the ions that are not... more
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10/15/19

Limiting Reactant: Compare Products
For the following reaction, 0.241 moles of barium hydroxide are mixed with 0.416 moles of sulfuric acid.barium hydroxide (aq)+sulfuric acid (aq)= barium sulfate (s)+ water(l)What is the formula for... more
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10/15/19

To precipitate all of the Pb2+ cations found in an 68 ml solution of 0.796 molarity Pb(NO3)2 you will need to add ________ grams of Na2SO4 .
I honestly have no idea where to even begin when trying to solve it.
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10/15/19

Chemistry - A 170.0 mL solution of 2.773 M strontium nitrate is mixed with 200.0 mL of a 3.354 M sodium fluoride solution. Calculate the mass of the resulting strontium fluoride precipitate.
help me please, A 170.0 mL solution of 2.773 M strontium nitrate is mixed with 200.0 mL of a 3.354 M sodium fluoride solution. Calculate the mass of the resulting strontium fluoride... more
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10/15/19

Determining the Mass of a Product of a Gas Phase Reaction
How many grams of sodium are needed to produce 10.5 L of hydrogen gas according to the following reaction at 25 °C and 1 atm? Answer in grams of sodium sodium (s) + water(ℓ) ----> sodium... more
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10/15/19

) If 55.8 mL of a BaCl2 solution is needed to precipitate all the sulfate ion in a 521 mg sample of Na2SO4, what is the molarity of the BaCl2 solution?
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10/15/19

Charles’s Law chem
A sample of krypton gas at a pressure of 775 mm Hg and a temperature of 25 °C, occupies a volume of 6.29 liters. If the gas is cooled at constant pressure to a temperature of -6 °C, the volume of... more
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10/15/19

avogadros law in gas reduction
A sample of gas contains 0.1500 mol of NH3(g) and 0.1875 mol of O2(g) and occupies a volume of 10.9 L. The following reaction takes place:4NH3(g) + 5O2(g)4NO(g) + 6H2O(g)1.Calculate the volume of... more
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10/15/19

ideal gas law calculating moles
A 5.46 gram sample of nitrogen gas has a volume of 868 milliliters at a pressure of 3.49 atm. The temperature of the N2 gas sample is ________ °C.It is desired to inflate a baggie with a volume... more
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10/15/19

ideal gas law and calculating presure
1.A sample of krypton gas collected at a pressure of 954 mm Hg and a temperature of 277 K has a mass of 84.6 grams. The volume of the sample is ______ L.2.A 5.46 gram sample of nitrogen gas has a... more
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10/15/19

combined gas laws
1.A sample of hydrogen gas occupies a volume of 6.95 L at 54.0°C and 0.700 atm.If it is desired to increase the volume of the gas sample to 9.61 L, while decreasing its pressure to 0.435 atm, the... more
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10/15/19

volume in ML and concentration
1.Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC8H4O4. This is often written in... more
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10/15/19

oxidation elements and reducing agents
Pb + ClO4-+ 2H+ClO3- + Pb2++ H2O Name of element oxidized:Formula of oxidizing reagent:Name of element reduced:Formula of reducing agent: Zn(OH)42- + Mn(OH)2Zn + MnO2+ 2H2O+ 2OH- Name of element... more
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10/15/19

Determine the energy of 2.00 mol of photons for each kind of light. (Assume three significant figures.)
Determine the energy of 2.00 mol of photons for each kind of light. (Assume three significant figures.)Part (a) 1540 nm to kJPart (b) 520 nm to kJPaart (c) 140 nm to kJ
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10/15/19

i got lost first i thought i understand it then i don't Please help me step by step
A solution is prepared by dissolving 10.98g of MgCl2in 646 mL of water. The total mass of the solution is 656.98g, and the total volume is 651 mL.A. what is m/m percent concentration of... more
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10/14/19

A reaction was shown to follow second-order kinetics. How much time is required for [A] to change from 0.500 M to 0.250 M? (k = 0.456 M⁻¹ s⁻¹)
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10/14/19

What amount of time is required for the concentration of A to decrease from 0.800 M to 0.200 M in the zero-order reaction A → B? (k = 0.0567 M*s⁻¹)
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10/14/19

How long will it take for the concentration of A to decrease from 0.500 M to 0.200 M in the first-order reaction A → B? (k = 0.800 s⁻¹)
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10/14/19

What mass of DDT is formed, assuming 100% yield?
DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction. 2 C6H5Cl + C2HOCl3 → C14H9Cl5 + H2O chlorobenzene chloral DDT In a government lab, 477.8 g... more
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10/14/19

Calculate the molar mass of cyanocobalamin, assuming that there are fourteen atoms of nitrogen in every molecule of cyanocobalamin.
Vitamin B12, cyanocobalamin, is essential for human nutrition. It is concentrated in animal tissue but not in higher plants. Although nutritional requirements for the vitamin are quite low, people... more
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10/14/19

Silver oxide, ammonium hydroxide, and ammonium nitrate form water and a compound containing 52.89% Ag, 20.61% N, 2.97% H, and 23.53% O. Calculate mass of each reactant to produce 45.35 g of compound.
(See here for the full question - the title put a character limit). Three compounds, silver oxide, ammonium hydroxide, and ammonium nitrate react to form a complex silver compound and water. The... more
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10/14/19

the equilibrium constant expression for the reaction
The reaction for the formation for the diamminesilver(I) ion is as follows: Ag+ (aq) + 2NH3 (aq) ⇌ [Ag(NH3)2] + (aq)
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10/14/19

Gas Law Problem 1.1
Calculate the volume (in liters) occupied by 8.50 g of NH3 at STP.
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10/14/19

What mass of Na2SO4is produced when sulfuric acid reacts with 0.500 molesof sodium chloride?NaCl + H2SO4HCl + Na2SO4
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