12. Assuming that the density of water is 1.00 g/mL, how many moles of water are

Question

12. Assuming that the density of water is 1.00 g/mL, how many moles of water are there in a liter of water? a. 0.0180 moles d. 100 moles b. 18.0 moles e. 1.00 moles c. 55.5 moles    Answer is C(55.5 moles) but why    19. The cooling system in an automobile holds 10.0 L of ethylene glycol antifreeze. How much energy is absorbed when the temperature of the ethylene glycol goes from 20 to 100 ? The density and specific heat capacity of ethylene glycol are 1.11 g/mL and 2.42 J/(g ), respectively. a. 215 J d. 2,150 kJ b. 2,150 J e. 1,940 kJ c. 1,940 J ( need help setting it up)

Explanation / Answer

Mass of water,m=volume x density

=1.00 L x 1.00 g/mL

= 1.00x1000 mL x 1.00 g/ mL

= 1000g

Molarmass of H2O = 18 g/mol

So number of moles,n=mass/molarmass

= 55.5 moles

19-

Density of Ethylene glycol=1.11 g/ml

Volume of Ethylene glycol=10 L = 10000 ml

C(Specific Heat) of ethylene glycol = 2.42 J/g0C

Mass of ethylene glycol=Density*Volume=1.11*10000=11100g

Energy absorbed= mC(Ti-Tf)=11100*2.42*80=2150 kJ

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