Question

A sample of sodium reacts completely with 0.497 kg of chlorine, forming 819 g of sodium chloride. What mass of sodium reacted? Express your answer to three significant figures and include the appropriate units

How many moles of methane are produced when 48.1 moles of carbon dioxide gas react with excess hydrogen gas?

Express your answer with the appropriate units.

How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 76.6 moles of water vapor?

Express your answer with the appropriate units.

Answer 1

2Na(s) + Cl2(g) -----------------> 2NaCl(s)

2 moles of NaCl produced from 2 moles of Na

2*58.5g of NaCl produced from 2*23g of Na

819g of NaCl produced from = 2*23*819/(2*58.5)   = 322g of Na

2.

CO2(g) + 4H2(g) ----------------> CH4(g) + 2H2O

1 mole of CO2 react with excess of H2 to gives 1 mole of CH4

48.1mole of CO2 react with excess of H2 to gives 48.1moles of CH4

48.1moles of CH4 >>>>answer

3.

CO2(g) + 4H2(g) ----------------> CH4(g) + 2H2O

2 moles of H2O vapor produced 4 moles of H2 react with excess of CO2

76.6moles of H2O vapor produced = 4*76.6/2   = 153.2moles of H2 react with excess of CO2

153.2 moles of H2 >>>>answer