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Question

55<br/>What mass of Na 2SO 4 is needed to prepare 350. mL of a solution

having a sodium ion concentration of 0.125 M?

-6.21 g
-12.4 g
-24.9 g
-3.11 g

57
Give the correct number of significant figures and units to the problem below. 5.46 m 3/ 2.01 m 2 


1 US barrel = 4.21 cubic feet. Express this volume in liters.
119 L
3.99 × 10-5 L1
.99 × 10-2 L
19.9 L
105 L


61
Which of the following processes  always results in an increase in the energy of a system?

-The system loses heat and does work on the surroundings.
-The system gains heat and does work on the surroundings.
-None of these is always true.
-The system loses heat and has work done on it by the surroundings.
-The system gains heat and has work done on it by the surroundings.

Step-by-step answer

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Subject: Chemistry, Science

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