Question

was Query A sample of coal was analysed as follows: Exactly 1.000g weighed into a silica crucible. After heating for one hour at o 110°c, the residue weighed 0.979g. The crucible next was covered with a vented lid strongly for exactly minutes at 950 + 20°c . The residhe weighed 0.338 go the crucible was then heated without the cover, until a constant weight was oftained. The last residure wass a the t results found to above analysis & heated seven weigh 0.15g. Calculate the percentage results of the above analysis​

Answer 1

Answer:

Percentage of carbon=92.3%

Percentage of oxygen=7.7%

Hence, mass of carbon=0.923×78=71.994