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ss7ja [257]
3 years ago
14

How many formula units make up 15.0 g of magnesium chloride (MgCl2)?

Chemistry
1 answer:
tensa zangetsu [6.8K]3 years ago
8 0
The formula mass of MgCl - atomic mass of Mg + 2(atomic mass of Cl)
   formula mass - 24.3 + (35.45x2) = 95.2 
In 95.2 of MgCl₂ - there are 6.022 x 10²³ formula units of MgCl₂
Therefore in 15.0 g of MgCl2 - there are 6.022 x 10²³ /95.2 x 15.0 = 9.49 x 10²² formula units of MgCl₂
the number of formula units - 9.49 x 10²² formula units of MgCl₂
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