Calculate the number of molecules of CO2 in 85.0 g of CO2. __________molecules?

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Calculate the number of molecules of CO2 in 85.0 g of CO2. __________molecules?

2007-12-03 12:25:32 · 2 answers · asked by Krn Pwner 1 in Science & Mathematics ➔ Chemistry

2 answers

Atomic weights: C=12 O=16 CO2=44

85.0gCO2 x 1molCO2/44gCO2 x 6.02x10^23moleculesCO2/1molCO2 = 1.16 x 10^24 molecules CO2

2007-12-03 12:31:24 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋

First you have to find the molar mass of CO2. Then you can determine the moles of CO2 in 85.0g. When you have the moles, you multiply that by 6.022 x 10^23 ( avogadro's number) to find the number of molecules.

2007-12-03 12:30:30 · answer #2 · answered by Anthony L 2 · 0⤊ 0⤋