Question

What will be the mass of $2$ moles of $MgS{O_4}$?

Answer 1

We need to know that the $MgS{O_4}$ is an inorganic compound known as magnesium sulphate. It contains three types of elements: magnesium, sulfur and oxygen. A mole is defined as $6.02214076 \times {10^{23}}$ of some chemical unit, be it atoms, molecules, ions, or others.

Complete answer:
To solve this question we must know before what exactly the atomic mass of the particular element, atom or ion or compound given. Firstly we need to calculate the atomic mass of $MgS{O_4}$ .The atomic mass of magnesium is $24$, atomic mass of sulfur is $32$ and atomic mass of oxygen is $16$ since there are four oxygen atoms so the total mass of oxygen will be $64$. In total the atomic mass of magnesium sulphate comes out by adding the individual masses of all the atoms so the atomic mass of magnesium sulphate is $24 + 32 + 64$, so the mass comes out to be $120g/mol$. One mole of magnesium sulphate contains $120g$ , so two moles of magnesium sulphate will be $240g$. Number of moles can be calculated by using the formula given weight of any element or compound divided by the molecular weight of the same element or compound given.

Note:
We need to know that the mass of a mole of substance is called the molar mass of that substance. The molar mass is used to convert grams of a substance to moles and is used often in chemistry. The molar mass of an element is found on the periodic table, and it is the element's atomic weight in $g/mol$ .If the mass of a substance is known, the number of moles in the substance can be calculated.