Homework Help: chemistry

Posted by Anonymous on Thursday, February 10, 2011 at 9:49pm.

What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O?

2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution?

3. If you have 100.0 mL of a 25% aqueous solution of ethanol, what volumes of ethanol and water are in the solution?

4. What is the percent by volume of isopropyl alcohol in a solution that contains 24 mL of isopropyl alcohol in 1.1 L of water?

5. What is the Molarity of an aqueous solution containing 160.0 g of ammonium nitrate (NH4NO3) in 2500 m L of solution?

6. What is the Molarity of a bleach solution containing 11.7 g of NaOCl per liter of bleach?

7. Calculate the Molarity of 2.30 L of a solution containing 2.45 g of dissolved KBr.

8. How many moles of solute are contained in 15.25 mL of 2.10 M CaCl2?

9. How many grams of KOH are in 64.3 mL of a 0.0238M KOH solution?

10. What volume of a 3.00M KI stock solution would you use to make 0.300 L of a 1.25M KI solution?

can you please help me

chemistry - DrBob222, Thursday, February 10, 2011 at 10:31pm
We do better with short posts. I'll help with the first. To do all of these takes too long for a single post.
What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O?

%by mass = g solute/100 g solution.
%NaCl = 3.55 g NaCl/(3.55g NaCl + 88 g H2O)*100 = ??
chemistry - DrBob222, Thursday, February 10, 2011 at 10:32pm
We do better with short posts. I'll help with the first. To do all of these takes too long for a single post.
What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O?

%by mass = g solute/100 g solution.
%NaCl = 3.55 g NaCl/(3.55g NaCl + 88 g H2O)*100 = ??
chemistry - nora, Friday, May 13, 2011 at 11:17am
how do you calculate the % by mass of 3.55g of NaCl in 88g of water?
chemistry - kris, Friday, April 27, 2012 at 3:00pm
what is the percent by volume of isopropyl alcohol in a solution that contains 24 mL of isopropyl alcohol in 1.1L of water

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