Question

0.1 mole of compound S will weigh ...... g, (given the molar mass in g mol\(^{-1}\) C = 12, H = 1, O = 16)

Hint:

To find the weight of a given amount of substance, use the formula: \(\text{Weight} = \text{moles} \times \text{molar mass}\).

Answer 1

Correct Answer: 4.6

To determine the weight in grams of 0.1 mole of compound S, we first need to calculate the molar mass of compound S using its chemical formula. The compound S given is C₂H₆O.

Calculate the molar mass of C₂H₆O:

• Carbon (C): 2 atoms, each with a molar mass of 12 g/mol, so: 2 × 12 = 24 g/mol
• Hydrogen (H): 6 atoms, each with a molar mass of 1 g/mol, so: 6 × 1 = 6 g/mol
• Oxygen (O): 1 atom with a molar mass of 16 g/mol, so: 16 g/mol

Adding these values together gives the molar mass of C₂H₆O:

Molar Mass = 24 + 6 + 16 = 46 g/mol

To find the weight of 0.1 mole of C₂H₆O, use the formula:

Weight = Moles × Molar Mass

Weight of 0.1 mole = 0.1 × 46 = 4.6 g

The calculated weight is 4.6 g, which precisely matches the expected range of 4.6,4.6, confirming the correctness of the solution.