Question

1) In the balanced reaction N2(g) + 3H2 (g) -----> 2NH3 (g), what mass of ammonia could be produced from 7.628 grams of hydrogen gas?

2) How many lithium atoms are present in 68.7 grams of Li2O?

3) How many grams of carbon are present in 0.55 grams of acetaminophen? The formula for acetaminophen is C8H9O2N, and its molar mass is 151.18 g/mol.

4) What is the mass, in amu, of 8.441 moles of lead (ii) oxide?

5) For the reaction:C2H4(g) + O2 (g) ----> CO2 (g) + H2O (g) if 12.0 mol of CO2 are produced, how many moles of O2 are consumed?

-Please show work so i can redo the problems, thank you very much!!

Answer 1

N2(g) + 3H2 (g) -----> 2NH3 (g),

3 moles of H2 react with N2 to gives 2 moles of NH3

3*2g of H2 react with N2 to gives 2*17g of NH3

7.628g of H2 react with N2 to gives = 2*17*7.628/3*2   = 43.225g of NH3

2. no of atoms = W*6.023*10^23* atomicity/G.M.Wt

G.M.Wt of Li2O   = 30g/mole

W                       = 68.7g

atomicity of Li in Li2O   = 2

no of atoms of Li = W*6.023*10^23* atomicity/G.M.Wt

                              = 68.7*6.023*10^23*2/30    = 2.75*10^24 atoms

3. The formula for acetaminophen is C8H9O2N,

and its molar mass is 151.18 g/mol.

    1 mole of acetaminophen contains 8 moles of carbon

   151.18g of acetaminophen contains 8*12g of carbon

   0.55g acetaminophen contains    = 8*12*0.55/151.18   = 0.35g of carbon

4. no of mole of PbO   = 8.441 moles

mass of PbO   = no of moles * gram molar mass

                         = 8.441 *223.2   = 1884g

5.    C2H4(g) + 3O2 (g) ----> 2CO2 (g) + 2H2O (g)

    2 moles of CO2 produced from 3 moles of O2

    12 moles of Co2 produced from = 3*12/2    = 18 moles of O2 >>>>answer