If calcium bromide (cabr2) is added to silver nitrate (agno3), what precipitate will form?
a. agno3
b. cao3
c. agbr
d. cabr2

The correct answer option C.

Explanation:

When calcium bromide is added to the silver nitrate precipitates of silver bromides are formed which is pale yellow in color.

The chemical reaction is given by:

Hence, the correct answer is option C.

The answer is 3.23 mol.

Given data:

Mass in gram of MgCl2 = 308

Molecular mass = 95.21 g/mol

Number of moles = ?

Formula:

Number of moles = Mass in grams / Molecular mass

By putting the values in above formula:

Number of moles = 308 / 95.21

                           = 3.23 mol

So if the weight of MgCl2 is 308 grams. So by the formula of number of moles, it will contain 3.23 moles. Mass in grams of MgCl2 is divided by its molecular mass to get number of moles of MgCl2.