#CaH_2(s) + 2 H_2O(l)= Ca(OH)_2(aq) + 2 H_2(g)# How many grams of CaH2 are needed to generate 10.0 L of H2 gas if the pressure of H2 is 720. torr at 16°C?
This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generating H2 is desired.
This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generating H2 is desired.
1 Answer
You need 8.40 g of
Step 1. Use the Ideal Gas Law to calculate the moles of hydrogen.
The Ideal Gas Law is
#color(blue)(|bar(ul(PV = nRT)|)# ,
where
#P# is the pressure#V# is the volume#n# is the number of moles#R# is the gas constant#T# is the temperature
We can rearrange the Ideal Gas Law to get
#n = (PV)/(RT)#
Step 2. Calculate the moles of
The balanced equation is:
Step 3. Calculate the mass of