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To do this you need to work out formula mass, the weight of 1 mole of any chemical.

Waters formula is H2O so write;

2H

O

Then find the relative Atomic Mass of these elements

Hydrogens weigh is 1

Oxygen is 16

2x1

1x16

then add them together

2+16 = 18

that is the weight in grams of 1mole

so 36g is the weight of 2moles

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14y ago

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