chemistry test chapter 3 part 2

for the reaction represented by the equation 2Na+2H2O--->2NaOH+H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?

120g

For the reaction CH4 + 2O2 ® 2H2O + CO2, calculate the percent yield of carbon dioxide if 1000. g of methane react with excess oxygen to produce 2300. g of carbon dioxide.

83.88%

what is the empirical formula for a compound that is 31.9% potassium , 28.9% chlorine, and 39.2% oxygen?

KCIO3

a compounds empirical formula is NO2. if the formula mass is 92 amu, what is the molecular formula?

N2O4

what is the empirical formula for a compound that is 53.3% O and 46.7% Si?

SiO2

what is the measured amount of a product obtained from a chemical reaction?

actual yield

the units of molar mass are...

g/mol

which statement i true if 12 mol CO and 12 mol Fe2O3 are allowed to react?

the limiting reagent is CO and 8.0 mol Fe will be formed

for the reaction represented by the equation Pb(NO3)2+ 2KI--->PbI2+ 2KNO3, how many moles of lead(2) iodide are produced from 300. g of potassium iodide and excess of Pb(NO3)2?

0.904

for the reaction represented by the equation CI2+2KBr--->2KCI+Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?

1.00 mol

When iron rusts in air, iron(III) 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

for the reaction represented by the equation 2H2 + O2 ----> 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?

108 g

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

14.7

in the reaction represented by the equation N2+3H2--->2NH3, what is the mole ratio of nitrogen to ammonia?

1:2

Ozone, O3, is produced by the reaction represented by the following equation: NO2(g)+O2(g)-->NO(g)+O3(g) What mass of ozone will form from the reaction 2.0 g of NO2 in a car's exhaust and excess oxygen?

2.1 g O3

iron(3) oxide is formed when iron combines with oxygen in the air. how many grams of Fe2O3 are formed when 16.7g of Fe reacts completely with oxygen?

23.9 g

for the reaction represented by the equation SO3+H2O--->H2SO4, how many grams of sulfuric acid can be produced from 200. g of sulfur trioxide and 100. g of water?

245g

in the reaction represented by the equation N2+3H2---->2NH3, what is the mole ratio of hydrogen to ammonia?

3:2

For the reaction 2Na + 2H2O → 2NaOH + H2, calculate the %tage yield if 80. g of water react with excess sodium to produce 4.14 g of hydrogen?

92%

what is the empirical formula of a substance that is 53.5% C, 15.5% H, and 31.1% N by weight?

C2H6N

which of the following is NOT an empirical formula?

C2N2H8

the molecular formula for vitamin C is C6H8O6. what is the empirical formula?

C3H4O3

a compound contains 27.3 g of C and 72.7 g of O. what is the empirical formula for this compound?

CO2

what is the empirical formula for a compound that is 36.1% Ca and 63.9% CI?

CaCI2

A balanced chemical equation allows one to determine the

mole ratio of any two substances in the reaction