Last lesson we calculated that propane has an energy of combustion of 2220 kilojoules per mole while hydrogen gas (rocket fuel)
has an energy of combustion of 286 kilojoules per mole. However, hydrogen gas has a much higher energy of combustion per gram than propane. Why is this? 
1 answer:
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Answer:
2700 kg/m³
Explanation:
First let's <u>convert 2.7 g/cm³ to kg/cm³</u>, keeping in mind that <em>1 kilogram equals 1000 grams</em>:
- 2.7 g/cm³ *
= 0.0027 kg/cm³
Finally we need to <u>convert 0.0027 kg/cm³ to kg/m³</u>, keeping in mind that<em> 1 meter equals 100 centimeters</em>, as follows:
- 0.0027 kg/cm³ *
= 2700 kg/m³
The answer is 2700 kg/m³.