Ascientist wished to carry out a chemical reaction in which two moles of aluminum combine with three moles of sulfur. he has 2.70 g of aluminum to react. how many grams of sulfur must he take to satisfy all the aluminum atoms?
1.51 g
2.14 g
3.41 g
4.81 g

Answer : The correct option is, 4.81 g

Explanation : Given,

Mass of aluminium = 2.70 g

Molar mass of aluminium = 26.98 g/mole

Molar mass of sulfur = 32.07 g/mole

First we have to calculate the moles of aluminium.

Now we have to calculate the moles of sulfur.

According to the question,

As, 2 moles of aluminium react with 3 moles of sulfur

So, 0.1 mole of aluminium react with of sulfur

Now we have to calculate the mass of sulfur.

Therefore, the mass of sulfur he take must be, 4.81 g

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)