Stoichiometry

How many liters of chlorine gas can be produced when 0.98 L of HCl react with excess O2 at STP?

0.49 L

How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 2Al(s) + 3FeO(s) -> 3Fe (s) + Al2O3 (s)

0.8 mol

Which conversion factor do you use first to calculate the number of grams of CO2 produced by the reaction of 50.6 g of CH4 with O2? the equation for the complete combustion of methane is: CH4 + 2O2 -> CO2 + 2H2O

1 mol CH4/ 16.0 g CH4

How many moles of glucose C6H12O6 can be burned biologically when 10.0 mol of oxygen is avaliable? C6H12O6 (s) + 6O2 -> 6O2 (g) +Al2O3 (s)

1.67 mol

At STP, how many liters of oxygen are required to react completely with 3.6 liters of hydrogen to form water? 2H2 (g) +O2 (g) -> 2H3PO4 (aq)

1.8 L

when iron rust in air, iron(111) oxide is produced. How many moles of oxygen react with 2.4 mol of iron in the rusting reaction? 4Fe (s) + 3O2 (g) -> 2Fe2O3 (s)

1.8 mol

How many liters of hydrogen gas are needed to react with CS2 to produce 2.50 L of CH4 at STP? 4H2 +CS2 -> CH4 + 2H2S

10.0 L

How many grams of chromium are needed to react with an excess of CuSO4 to produce 27.0 g Cu?

14.7

How many grams of beryllium are needed to produce 36.0 g od hydrogen ? assume an excess of water

162 g

In the reation 2CO(g)+O2 (g)-> 2CO2(g) what is the ratio of moles of oxygen used to moles of CO2

1:2

How many liters of NH3 are needed to completely react with 30.0 L of NO (at STP) 4NH3 + 6NO -> 5N2 + 6 H2 O

20.0 L

Hydrogen gas can be produced by reacting aluminum with Sulfuric acid. How many moles of sulfuric acid are needed to completely react with 15.0 mol of aluminum? 2Al (s) + 3H2SO4 (aq)->Al2 (SO4)3 (aq) + 3H2 (g)

22.5 mol

which of the following is an INCORRECT interpretation of the balanced equation shown below? 2S(s)+3O2(g)-> 2SO3(g)

2g S+ 3g O2 -> 2g SO3

If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you need if you want to use up all 3 eggs and 1 cup of oil?

3

Methane and hydrogen sulfide form when hydrogen reacts with carbon disulfide. Identify the excess reagent and calculate how much remains after 36 L of H2 reacts with 12 L of CS2.

3 L CS2

Hydrogen gas is produced when zinc reacts with hydrochloric acid. If actual yield of this reaction is 85%, how many grams of zinc are needed to produce 113

380 g

What is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3?

6.8 g

how many grams of H3PO4, are produced when 10.0 moles of water react with an excess of P2O10? P4O10 (s) + 6H2O (l) -> 4H3PO (aq)

653 g

When glucose is consumed, it reacts with oxygen in the body to produce carbon dioxide , water and energy. How many grams of carbon dioxide would be produced if 45 g of C6H12O6 completely reacted with oxygen?

66 g

Calcium oxide, or lime, is produced by the thermal decomposition of limestone in the reaction CaCOs --> CaO + CO2. What mass of lime can be produced from 1.5 x 10^3 kg of limestone?

8.4 X 10^2 kg

Lead nitrate can be decomposed by heating. What is the percent yield of the decomposition reaction 2 if 9.9 g Pb (NO3) are heated to give 5.5 of PbO?

82%

Which of the following is true about the total number of reactants and the total number of products in the reaction shown below. C5H12(l) + 8O2(g)-> 5CO2(g)+6H2O(g)

9 moles of reactants chemically changed to 11 moles of the product

which of the following is not true about limiting and excess reagents?

a balance equation is necessary to determined which reactant is the limiting reagent

Which of the following is NOT a reason why actual yield is less than theoretical yield?

conservation of mass

The first step in the most stoichiometry problems is to

convert given quantities to the moles

In a chemical reaction, the mass of the products

is equal to the mass of the reactants

In any chemical reaction, the quantities that are preserved are

mass and the number of ions

What is conserved in the reaction shown below? H2(g)+Cl2(g)-> 2HCl(2)

mass, moles, molecules, and volume

Which of the following is NOT true about "yield"?

the actual yield may be different from the theoretical yield because reactants do not always go to completion

When 0.1 mol of calcium reacts with 880 g of water, 2.24 L of hydrogen gas form (at STP). How would the amount of hydrogen produced change if the volume of water was decreased to 440 mL (440 g) ?

the volume of hydrogen produced would be the same