What would be the mass of 3 moles of water molecules? a
54 grams
b 40 grams
C
30 grams
d 20 grams

Explanation:

To convert from moles to grams, we must use the molar mass.

Recall that water's molecular formula is H₂O. It contains hydrogen and oxygen. Look up the two elements masses on the Periodic Table.

Now, use these masses to find water's mass. The subscript of 2 tells us there are 2 atoms of hydrogen, so we multiply hydrogen's mass by 2 and add oxygen's.

Use the molar mass as a ratio.

Multiply by the given number of moles.

The moles of water will cancel.

Round to the nearest whole number. The 0 in the tenth place tells us to leave the number as is.

There are about 54 grams of water in 3 moles.

the answer to your question is c.

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