The reaction between hydrochloric acid and aluminum produces hydrogen gas and aluminum chloride. the balanced reaction equation is given below. how many moles of h2 can be obtained when 3.40 mol hcl reacts with an excess of al?

              3.4 moles of H₂

The Balance Chemical Equation is as follow,

                                   2 Al + 6 HCl     →    3 H₂ + 2 AlCl₃

Calculating moles of H₂ produced,

According to equation,

                          3.0 moles of HCl produces  =  3.0 moles of H₂

So,

                 3.40 moles of HCl will produce  =  X moles of H₂

Solving for X,

                      X  =  (3.40 mol × 3.0 mol) ÷ 3 mol

                      X  =  3.4 moles of H₂

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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.