Home
Class 11
CHEMISTRY
Air contains 21% oxygen by weight. What ...

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

A

`2031.79`

B

`1023.5g`

C

`426.6g`

D

`160g`

Text Solution

Verified by Experts

The correct Answer is:
A
`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
Promotional Banner

Similar Questions

Explore conceptually related problems

A hydrocarbon contains 90% carbon by weight. What is its empirica formula?

Ametal oxide contains 53% of metal by weight. What is the equivalent weight of metal?

What is the weight of oxygen that is required for the complete combustion of 2.8 kg of ethylene?

Air contains 20% by volume of oxygen. The volume of air required for the compoete combustion of 1L of methane under the same conditions is

A gas mixture contains acetylene and carbondioxide. 20 lit of this mixture requires 20 lit of oxygen under the same conditions for complete combustion. The percentage by volume of acetylene in the mixture is

Air contains nitrogen and oxygen in the volume ratio of 4:1 . The average molecular weight of air is