October 17, 2012

## how many yards of soil are in a 30′x100′x16″ deep?

Do you mean a 30′x100′x16″ deep pile? Then just multiply 30 X100X 1 1/3 because 16″ = 1 1/3 ft.

Then divide by 27 because 1 cubic yard = 27 cubic feet

## how to make a solution containing 0.05% ammonium hydroxide and 0.5% Triton X100?

both ammonium hydroxide and triton x100 are liquids

Ammonium hydroxide is an aqueous solution of ammonia in water. It is commercially available in different concentrations.

Lets say we begin with a concentration of 20 % (w/w) (20 g ammonia in 100 g solution). A 0.05 % (w/w) solution means there are 0.05 g = 50 mg of active mass (NH3) in 100 g solution.
Now we have to find out how many grams of a 20 % ammonia solution is needed to make 50 mg of pure NH3. This is obviously 250 mg, because one fifth of it (20 % = 20 from 100 = 1/5) is 50 mg. So we take 250 mg of ammonia solution 20 %. And we take 500 mg of the Triton which is supposed to be a concentrated substance and not a diluted one. The sum is 550 mg = 0,550 g. We add to a total of 100 g with water (100 – 0,550 = 99,450 g water.) Thats it.

## how to get an answer 19.53% from equation [(1.018)10-1]X100=19.53%?

i need a formula ang step by step solution to arrived the answer of 19.53% from the equation [(1.018)10-1]X10=19.53%.. thanks

I think you may have mis-copied the equation- there’s a “to the power of” sign missing.

( (1.018^10) – 1 ) = 0.1953

To express as a percentage,

0.1953 * 100 = 19.53%