chemistry........

Question

Solid lithium hydroxide is used to remove exhaled carbon dioxide from space vehicles by forming lithium carbonate and liquid water. What mass of carbon dioxide can be absorbed by 30.60 grams of lithium hydroxide?

Answer 1

2LiOH+CO₂→Li₂CO₃+H₂O

30.60 g of LiOH → ? g CO₂

steps:

1) g of LiOH to mol LiOH with molar mass

2) mol LiOH to mol CO2 with coefficients

3) mol CO2 to grams CO2 with molar mass

NOTE: molar mass is NOT affected by coefficients, and depends only on the periodic table masses

step 1

mol=mass/molarmass

(30.60gLiOH) / (23.947g/mol LiOH)=1.2778 mol LiOH

step 2

1.2778 mol LiOH (1molCO₂ / 2molLiOH)=0.6389 mol CO₂

step 3

0.6389 mol CO₂ (44.009 g CO₂ / 1 mol CO₂)= 28.117 g CO₂

probably round to 4 sig figs, based on the 40.60 initial value

28.117 g CO₂ = 28.12 g CO₂