Ncert 8.3 class 7 . (1) Chalk contains calcium, carbon and oxygen in – InterviewSolution

1.	Ncert 8.3 class 7 . (1) Chalk contains calcium, carbon and oxygen in the ratio 10:3:12. Find the percentageof carbon in chalk.(0) If in a stick of chalk, carbon is 3g, what is the weight of the chalk stick?
Answer» the ratio of CARBON=3total ratio =10+3+12=25percentage of carbon = 3/25×100=12% 0)for 12% the mass of the carbon is 3gfor 100% the TOTAL mass is?=100×3/12 =25×1/4 = 25 gramStep-by-step explanation:hope it is helpful

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