I believe you would just put a 2 in front of NH3 and keep the other ones as 1
All of these are compounds except oxygen because a compound is two or more different elements bonded together.
The answer is studying how people use time.
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Answer:
606 atoms
Explanation:
Add the numbers 145 + 293 + 168
Answer: Option (c) is the correct answer.
Explanation:
Wood is a mixture of different substances. Primarily it consists of cellulose, lignin, water etc.
When we heat wood then all these substance oxidize into the atmosphere even before they could melt.
Whereas iron, sodium chloride and ethanol all are the substances which can melt at any temperature.
Thus, we can conclude that out of the given options, wood, a mixture of different substances is a material that does not melt at any temperature.