Answer:
m = 95.47 g
Explanation:
The reaction is missing. I found it, and here's the missing part:
SiO2(s) + 4HF(s) -> SiF4(s) + 2H2O(l) ΔH°rxn = -184 kJ
According to the reaction, 2 moles of water are produced in this reaction, and this also produces 488 kJ of energy.
To calculate the mass of any compound we use the expression:
m = n*MM
The molar mass of water is 18 g/mol. so, we need the moles of water to get the mass. The relation between the heat and energy is the following:
ΔH = Q/n ---> solving for n:
n = Q/ΔH.
So, let's calculate moles of water used here:
n = 488 * 2/184
n = 5.304 moles
Now we can calculate the mass:
m = 5.304 * 18
m = 95.47 g
