What is the relative formula mass of CH4?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

What is the relative formula mass of CH4?

Explanation:
The key idea is that the relative formula mass (Mr) is obtained by adding the relative atomic masses of all atoms in the formula. For CH4, there is one carbon atom (mass 12) and four hydrogen atoms (each mass 1). So Mr = 12 + 4×1 = 16. This is why the correct value is 16. The other numbers don’t fit the atoms present in CH4.

The key idea is that the relative formula mass (Mr) is obtained by adding the relative atomic masses of all atoms in the formula. For CH4, there is one carbon atom (mass 12) and four hydrogen atoms (each mass 1). So Mr = 12 + 4×1 = 16. This is why the correct value is 16. The other numbers don’t fit the atoms present in CH4.

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