How many moles of CO2 was added?

Question

Calculate the moles of CO2 added to the solution by all of the breaths used to make the solution
white. Report this value to three significant figures

Data:
initial mass of flask: 133. 88g
number of breaths: 5
mass of flask after breaths added: 133.98

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Answer 1 · 2018-03-19T02:34:46

#2.27xx10^-3 " mol" " CO"_2#

First, find the mass of #"CO"_2# added to the solution:

#133.98 " g" - 133.88 " g"=0.1" g" #

Then convert from grams to moles of #"CO"_2# by dividing by its molecular weight (#44.01 " g/mol")#:

#0.1 cancel" g" "CO"_2 * (1 " mol CO"_2)/(44.01 cancel" g" " CO"_2)=2.27xx10^-3 " mol" " CO"_2 #