How many chloride ions are there in 4 mol of CaCl2

48.176 ×10²³ chloride ions

Explanation:

Given data:

Number of chloride ions = ?

Number of moles of CaCl₂= 4 mol

Solution:

One mole of CaCl₂ contain 2 moles of chloride ions.

CaCl₂      →     Ca²⁺ + 2Cl⁻

4 moles of CaCl₂ contain,

4 ×2 = 8 moles of chloride ions

Number of chloride ions:

1 mole = 6.022×10²³ ions

8 mol × 6.022×10²³ ions/ 1 mol

48.176 ×10²³ ions

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.