A reaction produced 5 moles of moles of O2. Predict how many moles of KClO3 will react given the following equation. 2KClO3 --> 2KCl + 3O2?

1) 3.3
2) 7.5
3) 5
4) 15

1 Answer
Meave60
Jan 10, 2018

The answer is 1) 3.3

Explanation:

Balanced equation.

#"2KClO"_3("s")##rarr##"2KCl(s)" + "3O"_2("g")#

Multiply the given number of moles #"O"_2# by the mole ratio between #"KClO"_3# and #"O"_2# from the balanced equation, with #"KClO"_3"# in the numerator.

#5color(red)cancel(color(black)("mol O"_2))xx(2"mol KClO"_3)/(3color(red)cancel(color(black)("mol O"_2)))="3 mol KClO"_3# rounded to one significant figure

The answer is 1) 3.3, though, technically it should be rounded to one significant figure.

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