chemistry test chapter 3 part 4

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

for the reaction represented by the equation SO3+H2O--->H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid in an excess of water?

320. g

for the reaction 2Na+2H2O--->2NaOH+H2, how many grams of hydrogen are produced if 120. g of sodium and 80. g of water are available?

4.5 g

what is the %tage composition of CO?

43% C, 57% O

what is the percentage composition of CuCI2?

47.267% Cu, 52.733% CI

in the reaction represented by the equation 2Al2O3--->4Al+3O2, what is the mole ratio of aluminum to oxygen?

4:3

for the reaction represented by the equation 2Fe+O2--->2FeO, how many grams of iron(2) oxide are produced from 8.00 mol of iron in an excess of oxygen?

575 g

for the reaction represented by the equation CH4+2O2--->CO2+2H2O. how many moles of carbon dioxide aare produced from the combustion of 100. g of methane?

6.23 mol

how many grams of H3PO4 are produced when 10.0 moles of water react with an excess of P4O10?

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

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

72.8%

Lead nitrate can be decomposed by heating. What is the percent yield of the decomposition reaction if 9.9 g Pb(NO3 )2 are heated to give 5.5 g of PbO? 2Pb(NO3 )2(s) -->2PbO(s) + 4NO2(g) + O2 (g)

82%

For the reaction Cl2 + 2KBr - 2KCl + Br2, calculate the percent yield if 200 g of chlorine react with excess potassium bromide to produce 410 g bromine

90.9%

for the reaction represented by the equation CI2+2KBr---->2KCI+Br2 calculate the %tage yield if 200. g of chlorine react with excess potassium bromide to produce 410. g of bromine.

91.0%

for the reaction 2Na+2H2)---->2NaOH+H2, calculate the %tage yield if 80. g of water react with excess sodium to produce 4.14 g of hydrogen.

92%

for the reaction represented by the equation 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%

a compound empirical formula is CH3. if the formula mass is 30 amu, what is the molecular formula

C2H6

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

C3H4O3

a compounds empirical formula is C2H3. if the formula mass is 58 amu, what is the molecular formula?

C4H10

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

CO2

a compounds empirical formula is HO. if the formula mass is 34 amu, what is the molecular formula?

H2O2

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

KClO3

what is the empirical formula for a compound that is 43.6% phosphorus and 54.4% oxygen?

P2O5

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

SiO2

in most chemical reactions the amount of product obtained is...

less than the theoretical yield.

how many moles of aluminum are needed to react completely with 1.2 mol of FeO?

0.8 mol

how many moles of H3PO4 are produced when 71.0 g P4O10 reacts completely to form H3PO4?

1.00 mol

for the reaction represented by the equation 2H2+O2--->2H2O. how many moles of water can be produced from 6.0 mol of oxygen?

12 mol

what is the percentage composition of CF4?

13.6% C, 86.4% F