Which of the following describes a compound? (hint: carbon and oxygen both appear on the periodic table.)
oa
a piece of pure carbon, containing only carbon atoms
b. oxygen gas surrounding a solid piece of carbon
c. a substance made of two oxygen atoms for each carbon atom
d. carbon and oxygen atoms mixed without being bonded together
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A

Explanation:

a compound is a pure substance and A tells that

the temperature of the gas, in k, not celsius.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o