A 750.0 mL solution contains 5.00 g of NaOH. If the molar mass of NaOH is 39.9969 g/mol, what is the molarity of the solution? (3 points)
A:0.0891 M NaOH
B:0.167 M NaOH
C:1.25 M NaOH
D:5.98 M NaOH

B

Molarity is defined as M=(m/mw)/L solution where M is molarity, m is weight, mw is molar weight and L is liters.

First we plug in the mass, which is 5, then divide by the molar weight of 39.9969 which can just be rounded to 40.

Then we convert 750mL to liters which would be 0.75 liters. The root "milli" is x10-3, therefore we convert it to become 0.75L.

Now we just solve the equation, 5/40/0.75 is 0.166 repeating decimal, or just 0.167 rounding to three significant digits.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.