How many moles in 28 grams of co2

By John
2 Min Read

Solution

Answer
0.636 moles of CO
2
​
or using significant figures the answer would be 0.64 moles of CO
2
​

Explanation:
since we have a given mass of CO
2
​
which is 28 grams and also the chemical formula of carbon dioxide (CO
2
​
) we could get the molecular mass of CO
2
​
by using the periodic table and then when we have those information we could now get the number of moles of 28 grams of CO
2
​
.
GIVEN: m of CO
2
​
= 28g, Molecular Weight of C = 12 g/mol, O = 16 g/mol To get the molecular weight of CO
2
​
just add the molecular weights of each element and then multiply them by the number of atoms of each element. In this problem CO
2
​
, C has only one atom and O has two atoms in the compound. Therefore, getting molecular weight would be like this:Molecular weight of CO
2
​
= 12g/mol + 2(16 g/mol)= 44 g/mol of CO
2
​

Now we have the molecular weight of the compound and the given mass of compound which is 28 g. Therefore we could solve for the number of moles of CO
2
​
in 28 g of CO
2
​
.
Using Dimensional Analysis
28 g CO
2
​
x 1 mol CO
2
​
/44 g CO
2
​
= 0.636 mol of CO
2
​