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**atmosphere, carbon dioxide and water vapour help??**

(c)

One cubic metre (1 m3) of atmosphere at sea level contains 3.80 × 10(power of)2 ppm of CO2 and 5.00 × 10(power of)3 ppm of water vapour.

If there is a total of 2.6 × 10(power of)25 molecules in 1 m3 of air, calculate how many molecules of CO2 and water vapour there are in 1 m3 of air. Give your answers to the appropriate number of significant figures.

my workings-CO2 - 380 ppm water vapour - 5000 ppm

7.063% CO2, 92.463% water vapour

2.6 x 10(power of)25 / 100 = 2.6 x 10(power of)23

2.6 x 10(power of)23 x 7.063

CO2 1.8368 x 10(power of)24

water vapour 2.416336 x 10 (power of)25

As you can see what i have managed to do is completely loose the plot and don't even understand what i have done myself any help would be great cheers.