Calculate the amount of substance and mass of 0.6 × 10 ^ 23 molecules of phosphoric acid H3PO4.
| March 31, 2021 | education
N (H3PO) = 0.6 * 10 ^ 23 molecules.
Let us determine the amount of phosphoric acid substance and the mass of phosphoric acid.
We use the following formula.
N = n * Na.
Where N is the amount of substance.
n is the amount of substance.
N is Avogardo’s number, a constant equal to 6.02 * 10’23 molecules.
We find the amount of substance.
n = N / Na.
n = 0.6 * 10 ^ 23 / 6.02 * 10 ^ 23 = 0.0997 mol H3PO4.
Next, we find the mass of phosphoric acid.
n = m / M.
M (H3PO4) = 1 * 3 + 31 + 16 * 4 = 98 g / mol.
m = n * M = 98 * 0.0997 = 9.7706 g.
Answer: n = 0.0997 mol, m = 9.7706 g.
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