If silicon dioxide is heated with an excess of carbon, 27.9g of silicon carbide (SiC) along with some carbon monoxide are produced. Stoichiometry shows that 20.1g of silicon carbide should have been produced in this reaction

30litre of li2o is 1.0002mole approximately 1 mole

The answer is the first option just took the test

Idon't know hope someone you

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.