Calculations

Question 1

500g/L x 20L= ?

Answer 1

10,000 g or 10kg

Question 2

60 g of 5% cream….?

Answer 2

50mg/gram of cream x 60g = 3,000mg or 3g of cream active ingredient

Question 3

1ppm=
1ppb=
1ppt=

Answer 3

1 ppm= 1mg/kg= 1 ug/g; 1mg/L
1 ppb= 1 ug/kg= 1ng/g; 1 ug/L
1 ppt= 1ng/kg= 1pg/g; 1 ng/L

Question 4

1.0%= ?

Answer 4

10,000 ppm (mg/L)

Question 5

0.2% =

Answer 5

2,000 ppm

Question 6

100 ppm= ____ %

Answer 6

0.01%

Question 7

2 squares per 100 triangles=

Answer 7

2/100= 2%= 20,000 ppm

Question 8

A farmer lost 3 cows. The grass was analyzed and contains 228 ppm. If a cow ate 22lbs per day, and weighs 491lbs, could lead toxicosis result? (use 6mg/kg body weight/day as a toxic dose rate)
1 kg = 2.2 lbs

Answer 8

Grass has 228 ppm lead= 228 mg lead/kg grass (1ppm=1mg/kg). Grass intake was 228lbs/day= 10kg grass/day (2.2lbs= 1 kg). Cow weighs 491lbs= 223 kg
2280mg lead/223 kg= 10.2 mg lead/kg/day
so yes it exceeds the toxic dose that was given in the Q of 6mg/kg/bw/day

Question 9

If the lethal dose of poison in a dog is 0.35mg/lb, how many grams of a 0.2% grain infected with poison would it take to make a 10kg dog consume the lethal dose?

Answer 9

Lethal dose is 0.35mg/lb so convert mg/kg. 0.35mg/lb x 2.2lbs/kg= 0.77 mg/kg lethal dose. 0.2% poisoned grain converted to mg/kg: 0.2%= 2000mg poison/kg of grain (1%= 10,000 mg/kg).
Dog weighs 10kg, so 0.77mg/kg body weight x 10kg body weight= 7.7 mg poison for lethality.
1kg of grain has 2000mg poison, so to get 7.7mg, the dog would have to eat 7.7mg/2000mg poison/kg= 0.00385 kg of grain or 3.85g

Question 10

How many L in 5 gallons?

Answer 10

18.9L

Question 11

How many mL in 3 fl oz?

Answer 11

88.8 mL

Question 12

How many mg/kg are there in 5ppm?

Answer 12

5mg/kg