Answer :
Final answer:
To calculate the number of moles in a given mass, divide the mass by the molar mass. For copper(II) nitrate, the molar mass is found by adding up the atomic masses. Substituting the values gives the number of moles.
Explanation:
To calculate the number of moles in a given mass of a substance, you need to use the formula:
moles = mass / molar mass
Molar mass is the mass of one mole of a substance. For copper(II) nitrate (Cu(NO3)2), you can calculate the molar mass by adding up the atomic masses of each element:
Cu: 63.55 g/mol
N: 14.01 g/mol
O: 16.00 g/mol
So, the molar mass of copper(II) nitrate is:
(63.55 g/mol) + 2(14.01 g/mol) + 6(16.00 g/mol) = 187.55 g/mol
Now, substitute the given mass (1.57 g) and the molar mass (187.55 g/mol) into the formula:
moles = 1.57 g / 187.55 g/mol = 0.00835 mol
Therefore, there are approximately 0.00835 moles in 1.57 g of copper(II) nitrate.
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