Determine from the balanced chemical reaction if the derived mole ratio is correct or incorrect.

4Zn + 10HNO3 yields 4Zn(NO3)2 + N2O + 5H2O

(4 moles Zn / 5 moles H2O)

Balanced reaction:

The mole ratio (4 moles Zn/5 moles ) is correct.

Explanation:

Oxidation:

Balance N and O:

Balance charge:    ................(1)

Reduction:

Balance N:

Balance H and O:

Balance charge:  ............. (2)

[Equation-(1)] + [Equation-(2)]:

So, balanced reaction:

Hence the mole ratio (4 moles Zn/5 moles ) is correct.

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.