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Molarity, electron configuration, and concentration

Question 31
What is the molarity of a solution in which 26.0 grams of BaCl2 (molar mass = 208.2 g/mol) are dissolved in enough water to make 450.0 mL of solution?
0.278 M
0.617 M
1.00 M
3.41 M

Question 32
Which element has the following electron configuration?
1s22s22p63s2
Na
Mg
Al
Si
Ne

Question 33
Calculate the pH of beer in which the hydrogen ion concentration is 6.3 - 10-5 M
4.2
4.8
5.63
9.8
14.0

Question 34
Which of the following is a physical change?
water heated into steam
apples turning brown when exposed to air
milk turning sour
bleach removing color from fabric

Question 35
Which of the following scientists developed the nuclear model of the atom?
John Dalton
Robert Millikan
J. J. Thomson
Henry Moseley
Ernest Rutherford

Solution Preview

1) 0.278 M
moles = mass / molar mass
= 26 g / 208.2 g/mol
= 0.12488 moles
...

Solution Summary

This solution provides the answer to each question along with a brief calculation and/or explanation for this answer.

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