Chen exam 2

In the reaction Ca+Cl2--> CaCl2, what is the mole ratio of chlorine to calcium chloride

1:1

In the reaction 2H2+ O2 --> 2H2O, what is the mole ratio of oxygen to water

1:2

In the reaction N2+3H2--> 2NH3, what is the mole ratio of nitrogen to ammonia

1:2

How many mole ratio can be correctly obtained from the chemical equation 2NO -> N2+O2

3

For the reaction 2Na+Cl2--> 2NaCl, calculate the percentage yield if 200 g of chlorine react with excess sodium to produce 240 g of sodium chloride

72.8%

For the reaction 2Na+2H2O--> 2NaOH+H2, calculate the percentage yield if 80 g of water react with excess sodium to produce 4.14 g of hydrogen

92%

For the reaction SO3+H2O --> H2SO4 calculate the percentage yield if 500 g of sulfur trioxide react with excess water to produce 575 g of sulfuric acid

93.9%

The measured amount of a product of a reaction is called the

Actual yield

What is the measured amount of a product obtained from a chemical reaction

Actual yield

To determine the limiting reactant in a chemical reaction, one must know the

Available amount of each reactant

Actual yield must be determine by

Calculations

To determine the limiting reactant in a chemical reaction involving known masses of the two reactants, A and B, which of the following calculations would be the most useful

Finding the masses of the products

The actual yield of a chemical reaction is

Less than the theoretical yield

A chemical reaction involving substances A and B stops when B is completely used. B is the

Limiting reactant

The substance that controls the quantity of product than can be formed in a chemical reaction is the

Limiting reactant

The substance that restricts the participation of other reactants in a chemical reaction is known as the

Limiting reactant

The unit of the following expression is __ 100 g H2O x 1 H2O/ molar mass H2O

Mol

The expression below converts the quantity, mass HCl, to the quantity

Mol Cl2

If one knows the mass and the molar mass of reactant A and the molar mass of product D in a chemical reaction, one can determine the mass of product D produced by using the

Mole ratio of D to A from the chemical equation

A balanced chemical equation allows one to determine the

Mole ratio of any two substances in the reaction

The ratios obtained from the coefficients of substances in a balanced chemical equations are called___because they can be used to convert moles of one substance to moles of another substances

Mole ratios

The unit of the following expression is __ 100 g H2O x mil H2O/ 18.02 g H2O

Moles H2O

In the reaction, CH4(g)+2O2(g)--> CO2(g)+2H2O(g), a mass of 25g of CO2 is produced by reacting methane with excess water. The following expression calculates the

Moles of carbon dioxide produced

What is needed to calculate the mass of ammonia gas produced from 2.0 L of nitrogen gas in excess hydrogen gas in the reaction below. N2(g)+3H2(g)--> 2NH3(g)

One molar masses and two mole ratios

The ratio of an actual yield to theoretical yield x 100% is called the

Percentage yield

What is the ratio of the actual yield to the theoretical yield, multiplied by 100%

Percentage yield

The branch of chemistry that deals with the numerical relationship of elements and compounds as reactants and products in a chemical reaction is known as

Stoichiometry

The substance that is not used up completely in a chemical reaction is the

The excess reactant

In the chemical equation wA+xB --> yC+zD, if one knows the mass of A and the molar masses of A,B,C and D one can determine

The mass of any of the reactants or products

The expression below converts the quantity, volume C5H12, to the quantity

grams H2