When $$1$$ g of zinc was treated with dil. $$H2SO4$$,$$360cm3$$ of $$H2$$ gas at $$15$$∘C and $$758$$ torr. was liberated. When $$1g$$ zinc was added to copper nitrate solution $$0.965$$ g of copper was displaced. Calculate the equivalent weight of zinc and copper (1L$$ of $$H2$$ gas weighs $$0.09$$ $$g).

Question

When $$1$$ g of zinc was treated with dil. $$H2SO4$$,$$360cm3$$ of $$H2$$ gas at $$15$$∘C and $$758$$ torr. was liberated. When $$1g$$ zinc was added to copper nitrate solution $$0.965$$ g of copper was displaced. Calculate the equivalent weight of zinc and copper (1L$$ of $$H2$$ gas weighs $$0.09$$ $$g).

Infinity Learn · Accepted Answer

(i)              $$P1=758$$ torr; $$V1=360cm3T1=15+273=288K$$;$$P2=760$$ torr; $$V2=$$?,$$T2=273K$$.Using gas equation, we have :                     $$P1V1T1=P2V2T2$$;$$V2=P1V1T1$$×$$T2P2=758$$ torr. ×$$360cm3$$×$$273K288K$$×$$760$$ torr.   or $$V2=340.4cm3.1000cm3(=1L)$$ of $$H2$$ weighs $$=0.09g$$ ∴$$340.4cm3$$ of $$H2$$ weighs $$=0.09$$×$$340.41000g=0.0306g$$. Eq. wt. of $$Zn=Wt$$. of Zn×$$1.008Wt$$. of $$H2$$ at $$NTP=1$$×$$1.0080.0306$$ $$=32.9$$ g   (ii)   wt. of $$Zn=1g$$ , Wt. of $$Cu=0.965g$$  Eq. wt. of $$Cu=Eq$$.wt. of Zn×wt. of Cuwt. of Zn                    $$=32.9$$×$$0.9651=31.75$$

When 1 g of zinc was treated with dil. H2SO4,360cm3 of H2 gas at 15∘C and 758 torr. was liberated. When 1g zinc was added to copper nitrate solution 0.965 g of copper was displaced. Calculate the equivalent weight of zinc and copper (1L of H2 gas weighs 0.09 g).

Detailed Solution

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