A pound is approximately 0.45 kilogram. A person weighs 87 kilograms. What is the person’s weight, in pounds, when expressed to
the correct number of significant figures?
A. 190 lb
B. 180 lb
C. 52 lb
D. 39 lb
A. 190 lb
B. 180 lb
C. 52 lb
D. 39 lb
2 answers:
Answer:
190 pounds
Explanation:
Given that
A pound is approximately 0.45 kilogram
A person weighs 87 kilograms
Now change the unit form kilogram to pounds as follows:
1 pound / 0.45 kilogram * 87 kilograms
= 193.3 pounds
Now expressed to the correct number of significant figures
193.3 pound = 190 pounds
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Answer:
The correct answer is: X is nitrogen dioxide, and Y is a metal oxide
Explanation:
Combustion of compound of containing nitrogen and metal will give nitrogen dioxide and metal oxide as product. During combustion reaction a compound reacts with oxygen in order to yield oxides of elements present in the compound.
The general equation is given as:
Hence, the correct answer is :X is nitrogen dioxide, and Y is a metal oxide.