Calculate the mass fractions of elements in the compound H2SiO3.

| November 27, 2020 | education

To calculate the mass fraction of each element in a compound, you need to find the molecular weight of the entire compound. To find the molecular weight of the entire compound, you need to multiply the weight of an element by the index of that element and add the resulting numbers. If there is no index next to the element, then the index is one.
Mr (H2SiO3) = 1×2 + 28×1 + 16×3 = 2 + 28 + 48 = 78 g / mol
Now let’s calculate the mass fraction of each element. To calculate the mass fraction of an element, multiply the mass of the element by the index of the element and divide by the molecular weight of the entire compound.
W% (H2) = 1×2 / 78 = (approximately) 0.025
W% (Si) = 28×1 / 78 = (approximately) 0.358
W% (O3) = 16×3 / 78 = (approximately) 0.615



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