How many moles of cacl2 are needed to make 0.250 liters of 2.250m solution

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

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Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .