Based upon the following equation: 2 k + 2 hcl --> 2 kcl + h2 how many moles of k are needed to form 0.3 moles of h2? *
a) 0.15
b) 0.3
c) 0.6
d) 0.9

ljjjljlj kjlk,ljym jlyu; jm; l mumytj

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.