How many grams are there in 5.0 moles of #H_2O#?

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Answer 1 · 2017-01-26T21:42:06

#90g#

We first determine the molar mass of #H_2O# bij adding the atomic masses:
#2xx1.008+1xx16.00=18.016g//mol#

Multiply by the number of mols:

#5.0cancel(mol)xx18.016g/cancel(mol)=90.080g~~90g#

(we have to round to two significant digits).

Answer 2 · 2017-01-27T11:11:05

The formula for calculating moles = #"mass"/"molar mass"#
Therefore = #" molar mass * moles" = mass #

molar mass of water = 18g/mol
moles of water = 5
# 5 "*" 18 = 90#
Therefore there are 90 grams of water