General Chemistry Unit Conversion Homework Help!?

1) First convert the Fahrenheit value to a Celsius value, using this conversion equation...

C = (5/9) (F-32)

C = (5/9) (101-32)

C = (5/9) (69) = 345/9 = 38.33 degrees C

Now convert from Celsius to Kelvin (absolute) temperature scale, using this conversion equation...

K = C + 273

K = 38.33 + 273 = 311.33 K

2)

We have 35 mg/ 1 dl, and we know that

1000 mg = 1g

10 dl = 1 L

So we can first take "35 mg/dl" and turn it into grams:

(35 mg/dl) * (1 g/1000 mg) = 0.035 g/dl

Now we can convert from deciliters to liters:

(0.035 g/dl) * (10 dl/1 L) = 0.35 g/L

We set up a ratio to find out how many L we need to get 4.3 grams:

(0.35 g/ 1 L) = (4.3 g/ x L)

0.35x = 4.3

x = 12.29 L

3)

We have:

12 grains/ 1 tablet

And we know that a child has been given 6 tablets, so we just set up a ratio...

(12 grains / 1 tablet) = (x grains/ 6 tablets)

x = 72 grains

4)

The blood glucose level is given at 130 mg/dl.

We know that:

1 Quart = .95 Liters

10 dl = 1 Liter

Let's first convert the "130 mg/dl" to "mg/L"...

(130 mg/dl) * (10 dl/1 L) = 1300 mg/L

And we know that the person has 6 quarts of blood, so let's go from quarts to liters...

(6 qts) * (.95 L/ 1 qt) = 5.7 L

We need to know how many grams there are, so let's set up a ratio...

x mg / 5.7 L = 1300 mg/ 1L

x = (5.7)(1300) = 7410 mg

Now convert the mg to grams...

(7410 mg) * (1 g/ 1000 mg) = 7.41 g

SI or metric is beautiful in that everything is a power of ten. So, you need to memorize the prefixes, which tell you what power of ten the units are. kilo = 1000 hecto = 100 deca = 10 units = 1 (meters or seconds or grams) deci = 1/10 centi = 1/100 milli = 1/1000 For mm^2, you're talking (1/1000)^2 times m^2 Basically, you move the decimal point left or right depending on the prefix.