(a) Lithium metal reacts with water to give lithium hydroxide and hydrogen gas.

Question

(a) Lithium metal reacts with water to give lithium hydroxide and hydrogen gas. If 75.5mL of hydrogen gas is produced at STP,

what is the mass of lithium metal that reacted?

2Li(s) + 2H2O(l) -> 2LiOH(aq) + H2(g)

(b) The Solvay process is used to manufacture baking soda, NaHCO3. In the process, CO2, NH3, H2O, and NaCl react to produce baking soda. If 25.0L CO2 and 20.0L NH3 react at STP, with excess water and sodium chloride, what is the limiting reactant? Calculate the mass of baking soda prodeced.

CO2(g) + NH3(g) + H2O(l) + NaCl(s) -> NaHCO3(s) + NH4Cl(aq)

*What is limiting reactant and Mass of NaHCO3?

Explanation / Answer

a). 2Li + 2H2O ==> 2LiOH + H2

Ideal Gas Law
PV = nRT that means that n (moles) = PV / Rt
1atm x 0.0755L / 0.0821 x 273K = 0.003368 moles H2

0.003368 moles H2 x (2 moles Li / 1 mol H2) = 0.006737 moles Li

0.006737 moles Li x 6.941 grams per mole = 0.04676 g L

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