Question 24 of 43beginner🔧 ApplyNumerical3 marks

Find the molecular mass of methane (CH₄). Atomic mass — C = 12 u; H = 1 u.

Correct Answer

The molecular mass of methane (CH₄) is 16 u.

Exercise: Pause and Ponder | Q: 22 | (Page 18)
For More Understanding

Explanation

To find the molecular mass of methane (CH₄), we add the atomic masses of all the atoms constituting the molecule. As stated in the chapter, molecular mass is the total mass of a molecule, calculated by adding the atomic masses of all the atoms constituting it. Following the pattern shown in Example 9.4 and 9.5, we multiply the atomic mass of each element by the number of its atoms present in the formula and then add them together.

Solution Steps

  1. Given: Atomic mass of C = 12 u; Atomic mass of H = 1 u

  2. Number of atoms in CH₄: Carbon = 1; Hydrogen = 4

  3. Calculation: Molecular mass of CH₄ = (12 u × 1) + (1 u × 4)

  4. Result: = 12 u + 4 u = 16 u

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