Molar mass 2 part question

Chemistry
Tutor: None Selected Time limit: 1 Day

Given that the molar mass of H3PO4 is 97.994 grams, determine the number of grams of H3PO4 needed to prepare 1.20 L of a 0.8 M H3PO4 solution. Show your work. (5 points)

(b) What volume, in liters, of a 0.8 M H3PO4 solution can be prepared by diluting 50 mL of a 3.5 M H3PO4 solution? Show your work. (5 points

Oct 22nd, 2015

Thank you for the opportunity to help you with your question!

Part a

moles in 1.2 L =?

= 1.2L/1L * 0.8 MOLES = 0.96 moles

mass  in grams = moles * molar mass

=0.96 moles * 97.994 g/ mole = 94.07424 g

Part b

moles in 50 ml = ?

= 50/1000 * 3.5 = 0.175 moles

0.175 moles will be in what volume of 0.8 M H3PO4

= 0.175 mole/0.8 * 1000

= 218.75 ml

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 22nd, 2015

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