Question

How many moles of MgCl2 are there in 340 g of the compound?

Answer 1

Step-by-step explanation:

Moles is defined as mass divided by molar mass.

Mathematically, Number of moles = \frac{mass}{molar mass}[/tex]

Therefore, it is given that mass is 340 g and molar mass of
`MgCl_(2)` is 95.211 g/mol.

Hence, calculate number of moles as follows.

Number of moles =
`(mass)/(molar mass)`

=
`(340 g)/(95.211 g/mol)`

= 3.57 mol

Thus, we can conclude that there are 3.57 moles of MgCl2 are there in 340 g of the compound.

Answer 2

To calculate the amount of the compound in the units of grams, we need to first obtain for the molar mass of the compound. We calculate as follows:

MgCl2 = 24.31 + (2 x 35.45) = 95.21 g/mol

340 g MgCl2 ( 1 mol / 95.21 g ) = 3.57 mol MgCl2

Hope this answers the question. Have a nice day.