Question

How many grams of ethanol, C₂H,OH, can be boiled with 564.1 kJ of heat energy? The molar heat of vaporization of ethanol is

Answer 1

Answer: 672.2 grams

Explanation:

With 564.1 kJ of heat energy, $564.1/38.6=14.613989637306$ moles of ethanol can be combusted.

So, we need to find the formula mass of ethanol.

• The atomic mass of carbon is 12 g/mol.
• The atomic mass of oxygen is 16 g/mol.
• The atomic mass of hydrogen is 1 g/mol.
• So, the formula mass of ethanol is $2(12)+6(1)+16=46$ g/mol.

Therefore, the mass of ethanol is $(46)(14.613989637306)=672.2$ grams.