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Alenkasestr [34]
3 years ago
11

when 4.008 g of calcium metal is heated in the air, the sample gains 1.600 g of oxygen in forming the oxide. Calculate the empir

ical formula of the calcium oxide.
Chemistry
1 answer:
horsena [70]3 years ago
3 0

Answer:

CaO

Explanation:

Firstly, let’s get the percentage compositions.

The total mass is now = 4.008 + 1.600 = 5.608g

The percentage composition of carbon is thus 4.008/5.608 * 100 = 71.47%

The percentage composition of oxygen is 100 - 71.4 = 28.53%

Now, we divide each percentage by the atomic masses. The atomic mass of calcium is 40 while that of oxygen is 16

Ca = 71.47/40 = 1.78675

O = 28.53/16 = 1.783125

Both values are quite similar and dividing by the smallest will yield same values of 1.

Hence , the empirical formula is caO

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