24) 25) 0s000 6 800000m ice melting 2s) Chente! 29) 30) 25) silver tarmishing 29

Question

24) 25) 0s000 6 800000m ice melting 2s) Chente! 29) 30) 25) silver tarmishing 29) buming leaves 30) grinding peppercom into flakes SHORT ANSWER PROBLEMS. Determine the answer to the following questions. SHOW ALL WORK 31) The density of benzene at 25 C is 0.879 gicm. What is the volume, in mililiters, of 3.50 kg benzene? Pay atten your units! (5 pts) 910) Il-12 32) A hot tub is filled with 450 gal of water. How many calories are needed to heat the water from 21 C to 39 C? (5 pts) Density of water-1.00 gml. 1 gallon-3.79 liters. Watch your units! You should knoro the specific heat of water nl B-4

Explanation / Answer

density of benzene = 0.879g/cm3,

mass of benzene= 3.5 kg= 3.5*1000 gm

volume of benzene= mass of benzene/density= 3.5*1000/0.879 cc=3982 cc , 1000cc= 1L, 1L=1000ml

hence 1000cc= 1000ml, 1cc= 1ml

hence volume of benzene=3982ml

34. Mass of water to be condensed= 15 gm, when water condenses, latent heat of steam need to be removed and this is 540 cal/gm

hence heat to be removed= 15gm*540 cal/gm= 8100 cal

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