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

2 Answers
Jan 26, 2017

Answer:

#90g#

Explanation:

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).

Jan 27, 2017

Answer:

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

Explanation:

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