Question

how many atoms are present in
a) CA(OH)2
b) AL2 O2
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Answer 1

Answer:

a)- Calcium hydroxide, Ca(OH) 2 consists of one calcium atom (A r = 40), two oxygen atoms (A r = 16) and two hydrogen atoms (A r = 1).

b)- molecule of Al2O3 contains 3 atoms of oxygen. so, 1 mole of Al2O3 contains .

Explanation:

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Answer 2

Answer:

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a) Calcium hydroxide, Ca(OH) 2 consists of -

one calcium atom (A r = 40),

two oxygen atoms (A r = 16),

two hydrogen atoms (A r = 1).

b) Al2(SO4)3 A l 2 ( S O 4 ) 3 , there would be twelve atoms of oxygen.