Chemistry
(i) State the volume occupied by 40 gm. of methane at stp if it's vapour density is 8.
(ii) Calculate the number of moles present in 160 g of NaOH.
[Na = 23, H = 1, O = 16]
Stoichiometry
ICSE 2020
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Answer
(i) Gram molecular mass of methane = V.D. x 2 = 8 x 2 = 16 g
16 g of methane occupies 22.4 lit.
∴ 40 g of methane will occupy = x 40 = 56 lits.
(ii) Gram molecular mass of NaOH = 23 + 16 + 1 = 40 g
40 g of NaOH = 1 mole
∴ 160 g of NaOH = = 4 moles.
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