How to determine the formula is you know g and L?

Question

Moises

Chemistry

23 May, 14:26

How to determine the formula is you know g and L?

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Answers (1)

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Phoebe Bryan · Answer 1

1) Determine mass of water driven off:

15.67 minus 7.58 = 8.09 g of water

2) Determine moles of MgCO3 and water:

MgCO3 ⇒ 7.58 g / 84.313 g/mol = 0.0899 mol

H2O ⇒ 8.09 g / 18.015 g/mol = 0.449 mol

3) Find a whole number molar ratio:

MgCO3 ⇒ 0.0899 mol / 0.0899 mol = 1

H2O ⇒ 0.449 mol / 0.0899 mol = 5MgCO3 · 5H2O