Calculate the volume and number of molecules for 150 grams of acetylene (C2H2).

univerkov | November 22, 2020 | education

1. First you need to find the molar mass: M (C2H2) = 2 * 12 + 2 * 1 = 26 g / mol
2. Find the amount of substance: v = m / M = 150/26 = 5.77 mol
3. Now we can find the number of molecules: N = v * Na (Na = 6 * 10 23 (23-degree) = 5.77 * 6 * 10 23 = 34.62 * 10 23 = 3462 * 10 21
4. Volume: V = v * Vm (Vm = 22.4) = 5.77 * 22.4 = 129.25 l
Answer: N = 3462 * 10 21, V = 129.25 l

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