Cobalt (ii) nitrate (co(no3)2) exists as a hydrate with the composition of 37.1% water and 62.9% cobalt nitrate by mass. determine the molecular formula for this hydrate.

Co(NO₃)₂·6H₂O

Explanation:

Assume that you have 100 g of the hydrate.

Then you have 62.9 g Co(NO₃)₂ and 37.1 g H₂O.

1. You will need a chemical equation with masses and molar masses, so let’s gather all the information in one place.

:                                           182.94      18.02

                 Co(NO₃)₂·xH₂O ⟶ Co(NO₃)₂ + xH₂O

Mass/g:                                         62.9          37.1

2. Use the molar masses of each compound to calculate its number of moles.

3. Calculate the molar ratio of the two products.

Divide each number by the smaller number of moles (0.3438 mol).

4. Round off each number to the closest integer.

1 mol of Co(NO₃)₂ combines with 6 mol H₂O, so x = 6.

The formula of the hydrate is Co(NO₃)₂·6H₂O.

is it a purebred? it looks more like a red nose, but it doesn't have the red could it be a staffordshire bull terrior? unsure if that's the right name for it sorry

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.