Tin undergoes a synthesis reaction with hydrogen fluoride according to the
chemical equation below. How many grams of SnF2, are produced from the
reaction of 30.00 g HF with tin?

117.5 g of SnF₂ can be produced

Explanation:

Let's think the reaction:

Reactants are Sn and HF. Therefore the products are SnF₂ and H₂.

It is a redox reaction.

The equation is: Sn(s) + 2HF(g) → SnF₂(g) + H₂(g)

We convert the mass of the fluoride to moles

30 g . 1mol / 20g/mol = 1.5 moles of HF

By stoichiometry we produce 1 mol of SnF₂ with 2 moles of HF. Let's make a rule of three:

If 2 moles of HF can make 1 mol of SnF₂

Then, 1.5 moles of HF must produce (1.5 . 1) /2 = 0.75 moles of SnF₂

We convert the moles to mass  →  0.75 mol . 156.71 g /1mol = 117.5 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.