help wiht molormass equasions

# help wiht molormass equasions -...

This preview shows pages 1–4. Sign up to view the full content.

http://www.fordhamprep.org/gcurran/sho/sho/worksheets/worksht64a.htm Science Help Online Worksheet 6-4a Molarity Name__________________________ Section____________________________ This page is designed to help students practice written problems, and is meant to be printed out. Hit the print command and show all work in the spaces provided. Round your answer to the correct number of significant digits and show work. 1. How many grams of CaCl 2 would be required to produce a 3.5 M (molar) solution with a volume of 2.0 L? 2. What is the molarity of a 5.00 x 10 2 ml solution containing 249 g of KI? 3. How many moles of LiF would be required to produce a 2.5 M solution with a volume of 1.5 L? Answers 1) 780 g 2) 3.00 M 3) 3.75 moles

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This page is designed to help students practice written problems, and is meant to be printed out. Hit the print command and show all work in the spaces provided. Round your answer to the correct number of significant digits and show work. 1. How many grams of NaI would be used to produce a 2.0 M solution with a volume of 1.00 L? 2. What is the molarity of a 2.50 x 10 2 cm 3 solution containing 45.0 g of C 6 H 12 O 6 ? 3. How many moles of Sr(NO 3 ) 2 would be used in the preparation of 2.50 L of a 3.5 M solution?
Basic molarity problems where the molarity is the unknown. Example 1. What is the molarity of a 5.00 liter solution that was made with 10.0 moles of KBr ? Solution: We can use the original formula. Note that in this particular example, where the number of moles of solute is given, the identity of the solute (KBr) has nothing to do with solving the problem. # of moles of solute Molarity = ---------------------- Liters of solution Given: # of moles of solute = 10.0 moles Liters of solution = 5.00 liters 10.0 moles of KBr Molarity = -------------------------- = 2.00 M 5.00 Liters of solution Answer = 2.00 M Example 2. A 250 ml solution is made with 0.50 moles of NaCl. What is the Molarity of the solution? Solution: In this case we are given ml, while the formula calls for L. We must change

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/28/2008 for the course CHEM 201 taught by Professor Mccollel during the Spring '08 term at Western Illinois University.

### Page1 / 13

help wiht molormass equasions -...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online