1.

Calculate the weight of line (CaO) thatcan be prepared by heating 200 kgof limestone(CaCO_(3))whichis 95% pure.

Answer»

Solution :`CaCO_(3) to CaO + CO_(2)`
Actual amount of `CaCO_(3) = (95)/( 100) xx 200000 g = 190000 g`
Since CA atomsare CONSERVED, applying POAC for Ca atoms,MOLES of Ca in `CaCO_(3)` = MOLESOF Ca in CaO
`1 xx ` moles of `CaCO_(3) = 1 xx `moles of CaO
`(190000)/( 100) = (wt. of CaO)/( 56)""`(Rule 1, Chapter 1)
Wt. of CaO = 106400 g = 106.4 kg


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