Answer:
A.)
Step-by-step explanation:
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Answer:
Number of carbon atoms present in the sample are 391.
Step-by-step explanation:
We are given that,
Ratio of carbon to hydrogen atoms = 1 : 4
It is given that a sample of methane consists of 1564 hydrogen atoms.
Let the carbon atoms in the sample = x
So, we have the relation,

i.e. 
i.e. 
i.e. x= 391
Hence, the number of carbon atoms present in the sample are 391.
a quantity obtained by the addition of products of the elements of a square matrix according to a given rule.
The set of data can be:
20, 20, 20, 20
Their mean would be:
20 + 20 + 20 + 20 = 80/4 = 20
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Answer:
the answer is c
Step-by-step explanation:
add the sum