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3 years ago

How many formula units make up 12.8 g of magnesium chloride (MgCl2)? Express the number of formula units numerically.

Chemistry

1 answer:

Cloud [144]3 years ago

6 0

<h3>Answer:</h3>

8.09 × 10²² formula units

<h3>Explanation:</h3>

Mass of MgCl₂ is 12.8 g

Required to calculate the formula units

1 mole of a compound contains the Avogadro's number formula units

That is;

1 mole = 6.022 × 10²³ formula units

<h3>Step 1: Calculate the moles of MgCl₂ in 12.8 g </h3>

The molar mass of MgCl₂ is 95.211 g/mol

Number of moles = Mass ÷ molar mass

Moles of MgCl₂ = 12.8 g ÷ 95.211 g/mol

= 0.1344 mole

<h3>Step 2: Calculate the formula units of MgCl₂</h3>

1 mole = 6.022 × 10²³ formula units

Therefore;

Number of formula units = Moles × 6.022 × 10²³ formula units

= 0.1344 mole × 6.022 × 10²³ formula units

= 8.09 × 10²² formula units

Therefore, there are 8.09 × 10²² formula units in 12.8 g of MgCl₂

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