The coefficients are missing from the skeleton equation: Cr + Fe(NO3)2 -> Fe + Cr(NO3)3. When balanced, the SUM of all the coefficients is .

10.

Explanation:

Hello,

In this case, for the given reaction:

By knowing the law of conservation of mass must be respected, the following coefficients do balance the chemical equation:

So the sum of all the coefficients is 10.

Regards.

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

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.