Air contains 21% oxygen by weight. What weight of air is required t burn 200 g of coal which contains only 80% combustible material

Air contains 21% oxygen by weight. What weight of air is required t bu

1.	Air contains 21% oxygen by weight. What weight of air is required t burn 200 g of coal which contains only 80% combustible material
Answer» `2031.79` `1023.5g` `426.6g` `160g` Solution :`underset("12g")(C)+underset("32g")(O_(2))rarrunderset("44g")(CO_(2))` wt. if combustible meterial `(80)/(100)xx200=160g` `12g C_________32g` OXYGEN `160g C________426.6g` oxygen To get 21g oxygen - take 100g air To get 426.6g oxygen - take 2031.7g air