Question

How many grams are present in 7.2 mol of table salt, NaCl?

Answer 1

So to find the molar mass of NaCl, we need to add both the molar weight for sodium (Na) and chlorine (Cl) from the periodic table:

`22.99g+35.45g=58.44g`

This is the molar weight of table salt, NaCl.

So we are told we have 7.2 moles of this substance. Then we can set up an equation, cancel units, and solve for the amount of grams that this is:

`(58.44g)/(1mol)*7.2mol=420.768g`

So now we know that 7.2 mol of NaCl is equal to 420.77g.

Answer 2

Answer: -

421.2 g

Explanation: -

Atomic mass of Na = 23 g / mol

Atomic mass of Cl = 35.5 g / mol

Molar mass of NaCl = 23 x 1 + 35.5 x 1

= 58.5 g / mol

Number of moles of NaCl = 7.2 mol

Mass of NaCl = number of moles x molar mass

= 7.2 mol x 58.5 g/ mol

= 421.2 g