Question

1. Solid lithium hydroxide is used to "scrub" CO2 from the air in spacecraft and submarines; it reacts with the CO2 to produce lithium carbonate and water. What volume in liters of CO2 at 25°C and 715 torr can be removed by reaction with 405 g of lithium hydroxide? Enter to 3 sig figs.

2.The alkali metals react with the halogens to form ionic metal halides. What mass in g of sodium chloride forms when 6.00 L of chlorine gas at 0.977 atm and 22.8°C reacts with 19.1 g of sodium. Write a balanced chemical equation. Enter to 1 decimal place.

Answer 1

1]

The reaction is

2Li(OH) + CO2 ----> Li2CO3 + H2O

2 moles of LiOH reacts with 1 mole of CO2

MOles of LiOH = mass /molar mass = 405 / 24 = 16.875

16.875 moles of LiOH reacts with ---> 1*16.875/2 = 8.4375 moles of CO2

PV = nRT

P in atm

715 / 760 ---> in atm

715*V / 760 = 8.4375 *0.0821*(25+273)

V = 219.442 L of CO2

2]

PV = nRT

n = PV /RT = 0.24

Moles of Cl2 gas = 0.24

Moles of Na = mass /molar mass = 19.1 / 23 = 0.83

2Na + Cl2 ----> 2NaCl

2 moles of Na reacts with 1 mole of Cl2 and produces 2 moles of NaCl

0.24 moles of Cl2 reacts with 2*0.24 = 0.48 moles of Na and forms 0.48 moles of NaCl

Mass of NaCl = 58.44 *0.48 = 28.0512 gms

Answer is 28.0512 gms