Question

How many molecules are there in 122 grams of Cu(NO3)2?

Answer 1

There are 3.913× 10^23 molecules in 122 grams of Cu(NO3)2.

Answer 2

Answer:

There are approximately 2.95 x $10^{23$ molecules in 122 grams of Cu(NO3)2.

Explanation:

From the above question,

They have given :

To find the number of molecules in 122 grams of Cu(NO3)$.^{2}$, we need to first find the number of moles and then convert it to the number of molecules.

First, we need to determine the molar mass of Cu(NO3)$.^{2}$. The molar mass of Cu(NO3)2 can be calculated as follows:

Molar mass of Cu(NO3)$.^{2}$ = 63.55 + (14.01 x 2) + (16 x 6)

                                          = 249.6 g/mol

Next, we need to find the number of moles using the following formula:

Number of moles = Mass / Molar mass = 122 g / 249.6 g/mol

                             = 0.49 mol

Finally, we can convert moles to the number of molecules using Avogadro's number:

Number of molecules = Number of moles x Avogadro's number

                                    = 0.49 mol x 6.022 x $10^{23$ molecules/mol

                                    = 2.95 x $10^{23$ molecules

So, there are approximately 2.95 x $10^{23$ molecules in 122 grams of Cu(NO3)2.

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