How many percent is the mass fraction of oxygen in the combination of 6-valent sulfur with oxygen?

1. Let’s write down the formula, knowing that the valence of sulfur is 6, and the valence of oxygen is 2, 6: 2 = 3, that is, SO3;

2.Let’s find the molar mass of sulfur oxide (6):

M (SO3) = 32 + 3 * 16 = 80 g / mol;

3.Calculate the mass fraction of oxygen in the SO3 formula:

w (O) = (3 * Ar (O)): M (SO3);

w (O) = (3 * 16): 80 = 0.6 or 60%.

Answer: 60%.



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