Someone good in Chemisty.. I really need your help!!!?

Question

1)56.4 mi to km and to Mm
2.0 L to qt and to fl oz
7 ft 2.0 in to cm and to m
1.35 lb to kg and to dg
2)A normal valuve for blood cholesterol is 200 mg/ dL. If a normal adult has a total blood volume of 5 L, how much total cholestrol is present?
3)Diethyl ether, a substance once used as a general anesthetic, has a specific heat of 0.895 cal/ (gx Celsius). How many calories and how many kilocalories of heat are needed to raise the temp. of 30.0 g of diethyl ether from 10.0 celsius to 30.0 celsius.
4) Aspirin has a density of 1.40 g/cm3(cubed). What is the volume in cubic centimeters of a tablet weighing 250 mg?
5)What is the density of rubbing alcohol in grams per milliliter if a 5.000 ml sample weighs 3.928 g at room temp? What is the specific gravity of rubbing alcohol?
6) What dosage in grams per kilogram of body weight does a 130 lb woman receive if she takes two 250 mg tablets of penicillin? HOw many 125mg tablets should a 40lb child take to recieve the same dosage?

Answer 1

You need to invoke simple math facts that you know or that you are given to solve these problems. I shall do the first few for you. Then, you will get the idea.

1) 56.4mi x 1mi/0.63km = 89.5km; 89.5km x 1000m/km x 1000mm/m = 89,500,000mm

7ft 2in = 86in x 2.54cm/in x 1m/100cm = 2.18m

The point is to invoke conversion factors that you know, are given, or can look up. Then you invoke these math facts in such a way that the units cancel, numerator and denominator, and the numbers cancel also.

Answer 2

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