Question

Sarah measures out 151 grams of SO2. How many moles is this? Express your answer to three significant figures. 151 grams of SO2 is equal to moles.

Answer 1

151/(2*16 +32)=151/64=2.359 moles

Answer 2

There are 2.35 moles in 151 grams of $SO_2$.

Explanation:

The molecular mass of $SO_2$ is given by :

$M=32+2\times 16=64\ u$

We need to find the number of moles in 151 grams of $SO_2$. Let there n number moles. It is given by :

$n=\dfrac{m}{M}\\\\n=\dfrac{151}{64}\\\\n=2.35$

So, there are 2.35 moles in 151 grams of $SO_2$.

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