How many moles of NH3 can be produced from 28.0 mol of H2 and excess N2?

Since we have a large amount of N2 present, we know that H2 is the limiting reagent in this reaction

the reaction:

3 H₂ + N₂ --> 2 NH₃

so to get 2 moles of ammonia, we need to use 3 moles of hydrogen gas and we don't have to worry about the amount of nitrogen since we have an excess of it

Since we have 28 moles of hydrogen, 27 of which will react 3 at a time and we will be left with 1 extra mole of hydrogen

hence, 27 moles of h2 will react

since the ratio of moles of ammonia and the moles of hydrogen is 2/3

so, moles of hydrogen * 2/3 = moles of ammonia

27 * 2/3 = 18 Moles of Ammonia

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.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.