What is the final % w/w strength of a hydrocortisone ointment if you mix 60 gram

Question

What is the final % w/w strength of a hydrocortisone ointment if you mix 60 grams of 1% hydrocortisone ointment with 80 grams of 2.5% hydrocortisone ointment? 2.2 % w/w 1.85% w/w 1.75 % w/w 0.25 % w/w How many grams of erythromycin are contained in 2 ounces of a 2% w/v topical solution? 2.4 g 12 g 2.0 g 0.6 g Calculate the weight in pounds (Avoirdupois) of 128 ounces of glycerin (density = 1.25 g/mL). 10.5 lb 4.8 lb 2.2 lb 8.8 lb If one teaspoonful of diazepam 0.5% w/v solution is diluted up to the one-point mark with plain water, what will be the strength of the diazepam in mcg/mL in the final solution? 25 mcg/mL 52 mcg/mL 94 mcg/mL 0.125 mcg/mL You have a 1/8-ounce (Avoirdupois) tube of ophthalmic ointment. Express this weight in grams. 1.93 g 8.1 g 3.5 g 0.125 g

Explanation / Answer

Q1

w/w of hydrocortisone

m = 60 g of 1% hydrocortisone --> 60*1/100 = 0.6

m = 80 g of 2.5% hydrocortiseoon --> 80*2.5/100 = 2

total hydrocortisone = 2.6

total mass = 60+80 = 140 g

w%w = 2.6/140 *100 = 1.85714%

choose B

Q2

grams in 2 oz of w/v = 2%

2 fluid oz = 59.1471 mL

so..

if 2 % --> 59.1471*2/100 = 1.182942 grams

nearest answer is 1.2 g so choose B

Q3

mass of 128 oz of glyerin

1 fl oz = 29.5735 mL

128 oz = 29.5735*128 = 3785.408 mL

so...

mass = D*V = 1.25*3785.408 = 4725 grams

10.4 lb--_> nearest answer is 10.5 lb

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