Question

find the number and names of elements present in them and calculate the molecular masses.

1 Sulphur trioxide
2 Iron(2)sulphate
3 Ammonia
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Answer 1

(1). Sulphur trioxide
The formula of sulphur trioxide is SO3.
The elements present in this are- Sulphur and oxygen.
Molecular mass=SO3
= 32+3×16
=32+48
= 80

(2). Iron 2sulphate
FeSO4
= 55.8+32+ 16×4
55.8+32+64
=151.8
The elements present are-Iron, sulphur and oxygen.

(3). Ammonia
The formula is NH3
The molecular mass =14+ 3
= 17
The elements presents present are Nitrogen and Hydrogen.

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Answer 2

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