Question

If I have 7.0 x 10^24 formula units of magnesium chloride, how many grams of chlorine would I have?

Answer 1

824 g

Step-by-step explanation:

First we convert 7.0 x 10²⁴ formula units of magnesium chloride (MgCl₂) into moles, using Avogadro's number:

• 7.0 x 10²⁴ formula units ÷ 6.023x10²³ formula units/mol = 11.62 mol MgCl₂

There are two Cl moles per MgCl₂ moles, meaning that we have (2 * 11.62) 23.24 moles of Cl

Finally we convert 23.24 moles of chlorine into grams, using chlorine's molar mass:

• 23.24 mol * 35.45 g/mol = 824 g