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1. ### How do i calculate half-lives?

... (Ao) ln(100 / 6.25) = k x 112 years k = 0.02476 years^-1 100% at start (Ao) and 50% after 1 half life (A) ln(100/50) = 0.02476 x t...

1 Answers · Science & Mathematics · 04/10/2009

2. ### make 100ml of intermediate solution of 10mg L -1 SODIUM from 1000mg L-1?

1 mL of your 1000 mg L-1 stock is added to 99 mL diluent to give you 100 mL 10 mg L-1 working solution. 10 / 1000 = 1 / 100 = 1 + 99.

1 Answers · Science & Mathematics · 23/12/2010

3. ### How do you make a 1;100 ratio of bleach and water?

A 1:100 ratio means that for every 1 part of bleach you have 100 parts of water... by 101, you get 39.6mL per part. So, to make 4 L of 1:100 parts bleach you add 39.6mL to 3960 mL water. (The sum...

5 Answers · Science & Mathematics · 25/12/2008

4. ### Chem help! Molarity of solutions.?

The new molarity is 1.95 x 10^-6 M. You've simply done a 1:100 dilution.

1 Answers · Science & Mathematics · 04/12/2013

... .23 grams when you subtract 1.100-g from .870. Then you just do the grams to mole conversion. Again, start off with your ...

1 Answers · Science & Mathematics · 03/02/2010

2) For which set of conditions does a fixed mass of an ideal gas have the greatest volume? using...

2 Answers · Science & Mathematics · 05/10/2011

7. ### Chemistry homework! Moles masses and volumes and molecules help?

...the number of pennies by 100 to get the \$ each person would have (you do know that \$1 = 100 pennies?) 3. Calculate the molar mass of ...

1 Answers · Science & Mathematics · 08/01/2014

8. ### Permutations or Combinations?

if order does not matter than it is a combination and use the formula...

2 Answers · Science & Mathematics · 30/09/2011

9. ### There is 252 mg of cholesterol per 100 ml of blood. How many grams of cholesterol in 5.2 L of blood ?

... a prefix every three powers of ten, except for 100, 10, 1/10, and 1/100. To go from one to another you use the LARD rule: LEFT ...

4 Answers · Science & Mathematics · 24/08/2013

10. ### I don't understand this question at all. Please, break it down as simple as you can? Add formulas or equation.?

The explaination of this is not that easy to do, I hope this helps.. The question is asking you...

3 Answers · Science & Mathematics · 07/01/2009