A. How many grams of H2 gas are produced if 32
grams of CH4 gas are consumed?

Mass of H₂ produced = 12 g

Given

32 grams of CH₄

Required

mass of H₂

Solution

Reaction

CH₄ + H₂O (+ heat) → CO + 3H₂

mol CH₄(MW= 16 g/mol) :

= mass : MW

= 32 g : 16 g/mol

= 2

From the equation, mol ratio CH₄ :  H₂ = 1 : 3, so mol H₂ :

= 3/1 x mol CH₄

= 3/1 x 2

= 6

Mass H₂(MW = 2 g/mol) :

= mol x MW

= 6 x 2

= 12 g

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.