Question on: JAMB Chemistry - 2024
The number of molecules of helium gas contained in 11.5 g of the gas is:
A
1.73 x 1023
B
1.73 x 1022
C
1.73 x 1024
D
1.73 x 1021
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Correct Option: C
Calculation steps:
- Molar mass of He ≈ 4 g/mol
- Moles of He = 11.5 / 4 = 2.875 mol
- Number of molecules = 2.875 × 6.022 × 1023 ≈ 1.73 × 1024 molecules
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