NaHCO3 is heated such that the weight of residue formed is 0.265 g, the volume of CO2 formed at STP is
56 mL
112 mL
0.56 L
75 mL
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75 ml is formed at stp the volume of co2
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CHEMISTRY
2.0 g mixture of sodium carbonate and sodium bicarbonate on heating to constant mass gave 224 mL of CO
2
at NTP. The % mass of sodium bicarbonate in the mixture is:
December 27, 2019avatar
Dheerendra Chaudhari
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ANSWER
Sodium bicarbonate decomposes in
the following manner.
2NaHCO
3
→Na
2
CO
3
+H
2
O+CO
2
Sodium Carbonate is stable and
doesn't dissociate upon normal
heating.
Vol. of CO
2
=224ml
22.4Ltr=1mole
So moles of CO
2
=0.224/22.4=0.01mole
0.01mole=44×0.01g=0.44g
1 mole CO
2
is procured by 2 mole NaHCO
3
∴ Moles of NaHCO
3
=2×0.01=0.02
=0.02×84=1.689
% age =
Totalmass
mass
×100=
2
1.68
×100=84%
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