The density at 20 ∘C of a 0.828 M solution of acetic acid in water is 1.0052 g/mL. The molar mass of acetic acid, CH3CO2H, is 60.05 g/mol. What is the molality of the solution?

Answer : The molality of solution is, 0.866 mole/kg

Explanation :

The relation between the molarity, molality and the density of the solution is,

where,

d = density of solution  = 1.0052 g/ml

m = molality of solution  = ?

M = molarity of solution  = 0.828 M = 0.828 mol/L

= molar mass of solute (acetic acid) = 60.05 g/mole

Now put all the given values in the above formula, we get  the molality of the solution.

Therefore, the molality of solution is, 0.866 mole/kg

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms