Calculate the molar mass for sodium sulfate, n a2so4. a sample of sodium sulfate with a mass of 300.0 g represents what number of moles of sodium sulfate?

300 grams of sodium sulfate represents 2.112 moles

Explanation:

Step 1: Data given

Mass of Na2SO4 = 300.0 grams

Step 2: Calculate the molar mass of Na2SO4

Na = 22.99 g/mol

S = 32.065 g/mol

O = 16 g/mol

Molar mass of Na2SO4 = 2*22.99 + 32.065 + 4*16

Molar mass of Na2SO4 = 142.045

Step 3: Calculate moles of Na2SO4

Moles Na2SO4 = mass Na2SO4 / molar mass Na2SO4

Moles Na2SO4 = 300.0 grams / 142.045 g/mol

Moles Na2SO4 = 2.112 moles

300 grams of sodium sulfate represents 2.112 moles

h

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.