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Question

power company burns approximately 475 tons of coal per day to produce electricity if the sulphur content of the coal is 1. 2 percentage by weight how many tone SO​​​​​2 are dumped into the atmosphere each day?

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Solution

Firstly we need to find the weight of sulphur which is being burnt:

475 x 0.012 = 5.7

Now we need to change this into moles:

5.7/32.1 = 0.177 moles

This is the amount of moles of sulphur but we need to find the amount of SO2. The equation for the formation of SO2 is:

S + O2 -> SO2

Therefore we know that the amount of moles of SO2 is also 0.177 as it is a 1:1 ratio.
So all we need to do now is convert out of moles:

64.1 x 0.177= 11.34

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