Question #9885a

1 Answer
David Drayer
Aug 10, 2017

18 grams

Explanation:

# 6.02 xx 10^23# molecules equal a mole of molecules.

# H_2O# water has a molar mass of 18 grams

# 2 xx H = 2 xx 1 = 2 # grams for Hydrogen

# 1 xx O = 1 xx 16 = 16# grams for Oxygen

# 2 + 16 = 18# grams total for Water # H_2O#

A mole of water has a mass of 18 grams. so Avogardo's number of molecules = a mole = 18 grams.

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