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» <html><body><p>`2031.79`<br/>`1023.5g`<br/>`426.6g`<br/>`160g`</p>Solution :`underset("12g")(<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>)+underset("32g")(O_(2))rarrunderset("44g")(CO_(2))` <br/> wt. if combustible meterial `(<a href="https://interviewquestions.tuteehub.com/tag/80-337972" style="font-weight:bold;" target="_blank" title="Click to know more about 80">80</a>)/(100)xx200=160g` <br/> `12g C_________32g` <a href="https://interviewquestions.tuteehub.com/tag/oxygen-1144542" style="font-weight:bold;" target="_blank" title="Click to know more about OXYGEN">OXYGEN</a> <br/> `160g C________426.6g` oxygen <br/> To get 21g oxygen - take 100g air <br/> To get 426.6g oxygen - take 2031.7g air</body></html>