Question

How many moles of 12C are there in a 3.50 g sample of this substance?

Answer 1

1 mole C ------------- 12 g
? moles C ---------- 3.50 g

3.50 x 1 / 12 => 0.29 moles

Answer 2

`n_C=0.292molC`

Step-by-step explanation:

Hello,

In this case, by means of the given mass, we should remember that one mole of a particular element, equal its atomic mass. In such a way, since carbon is the involved element and its molar mass is 12g/mol, we perform the following mathematical operation in order to obtain the moles via proportions:

`n_C=3.50gC*(1molC)/(12gC) \\\\n_C=0.292molC`

Best regards.