Question

Calculate the molecular mass of the
following compounds -
i. Ammonia
ii. Hydrogen peroxide
iii. Ammonium chloride iv. Ethanoic acid
v. Aluminium chloride vi. H3PO4
vii. He gas
viii. water
ix. Chlorine gas (Cl2) (x) Oxygen gas

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Answer 1

Answer:

i Ammonia-NH3

Molecular formula=28+1*3=28+3=31

ii H2O2=2*1+16*2=2+32=34

iii NH4Cl=28+1*4+35=28+4+35=67

iv CH3-COOH=12+1*3+12+16+16+1=12+3+12+16+16+1=60

v AlCl3=27+35*3=27+105=132

vi H3PO4=1*3+31+16*4=3+31+64=98

vii He=4

viii H2O =1*2+16=18

ix Cl2=35*2=70

x O2=16*2=32

Note: Here '*' stands for multiply and the unit of molecular mass is u.

Hope it helps...

Happy Diwali...

Answer 2

BONJOUR!!!

Answer:

Molar masses of:

(i) Ammonia (NH3)

-------> 14 + (1×3) = 17g

(ii) Hydrogen peroxide (H2O2)

-------> (1×2) + (16×2) = 34g

(iii) Ammonium chloride (NH4Cl)

-------> 14 + (1×4) + 35 =53g

(iv) Ethanoic acid (CH3COOH)

-------> 12 + (1×3) + 12 + 16 + 16 + 1 = 60g

(v) Aluminium chloride (AlCl3)

--------> 26 + (35×3) = 131g

(vi) H3PO4

-------> (1×3) + 30 + (16×4) = 97g

(vii) He gas (He2)

-------> 4×2 = 8g

(viii) Water (H2O)

-------> (1×2) + 16 = 18g

(ix) Chlorine gas (Cl2)

--------> 35×2 = 70g

(x) Oxygen gas (O2)

---------> 16×2 = 32g

HOPE IT'LL HELP... :)