The heats of combustion of `CH_(4)` and `C_(4)H_(10)` are `-890.3` and `-2878.7 kJ mol^(-1)`, respectively. Which of the two has greater efficiency as fuel per gram?

Explanation

To determine which fuel, methane (CH₄) or butane (C₄H₁₀), has greater efficiency per gram, we will follow these steps:

### Step 1: Calculate the molar mass of methane (CH₄)
- The molar mass of methane can be calculated as follows:
- Carbon (C) has a molar mass of 12 g/mol.
- Hydrogen (H) has a molar mass of 1 g/mol.
- Therefore, for CH₄:
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