Calculate the mass fraction of oxygen in aluminum nitrate.
| May 8, 2021 | education
Given:
Al (NO3) 3.
To find:
w (O) -?
Decision:
w (O) = n * Ar (O): Mr (Al (NO3) 3) * 100%.
Mr (Al (NO3) 3) = 27 + 3 * 14 + 3 * 3 * 16 = 27 + 42 + 144 = 213.
w (O) = 9 * 16: 213 * 100% = 144: 213 * 100% = 0.68 * 100% = 68%.
Answer: w (O) = 68%.
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