Question

(a) Calculate number of moles as and molecules in 120 gram of CH3COOH ( C=12;H=1;O=16) 5
(b) Write down the chemical formula of
(1) Calcium phosphate
(2) Aluminium sulphate
(3) Sodium carbonate

Answer 1

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Answer 2

Answer

Explanation

(a)

• Concept- Moles of CH3COOH = given mass of CH3COOH/ Molecular mass of CH3COOH
• Molecules of CH3COOH= no. of moles x Avogadro number.

•Given- Given mass of CH3COOH = 120g

Avogadro mum - 6.022x10^23

Find- number of moles of CH3COOH and no. of molecules

Step by step explanation

1. Moles of CH3COOH = given mass of CH3COOH/ Molecular mass of CH3COOH

• Moles of CH3COOH=120/80=1.5 moles

2) Molecules of CH3COOH= no. of moles x Avogadro number.

Molecules of CH3COOH=1.5 x 6.022x10^23

Molecules of CH3COOH= 9.033 x10^23 molecules of CH3COOH

(b) 1) Ca3(PO4)2 is the chemical formula of calcium phosphate

2)Al2(SO4)3 is the chemical formula of aluminium sulphate

3) Na2CO3 is the chemical formula of sodium phosphate

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