Water has a specific heat of 4 point 1 8 6 the fraction with numerator cap j and denominator g times degree C , and ethanol has a specific heat of 2 point 4 5 0 the fraction with numerator cap j and denominator g times degree C Based on this information, which best compares water and ethanol?
Answer
A
Water has more protons and neutrons in its nuclei.
B
There are more molecules in a gram of water.
C
It requires more heat to raise the temperature of a gram of ethanol by .
D
Ethanol has a lower formula mass.
Explanation
For equal masses, water’s lower molar mass means a gram contains more molecules: about 1/18 mole of water versus 1/46 mole of ethanol. The specific heat values also show that raising 1 g of water by 1°C takes more heat (4.186 J) than raising 1 g of ethanol by 1°C (2.450 J). Thus, “There are more molecules in a gram of water” is the best comparison.
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