What is the relative formula mass of 2Cu(NO3)2?
I could do it if it was just Cu(NO3)2 but I don't know how you deal with the brackets when there is also a big number in front?
The formula mass is the same. When you calculate Cu + 2N + 6O that gives the formula mass of 1 mol Cu(NO3)2. If a 2 is in front, that means TWO mols Cu(NO3)2 so you have twice that amount but the formula mass hasn't changed. 3Cu(NO3)2 is three times that amount but the formula mass is the same.
Many thanks :)
To calculate the relative formula mass of 2Cu(NO3)2, you need to consider the individual atomic masses and the number of atoms present in the formula.
First, let's break down the formula into its constituent elements: copper (Cu), nitrogen (N), oxygen (O), and hydrogen (H).
Next, we need to find the atomic mass of each element from the periodic table. The atomic mass of copper (Cu) is approximately 63.55 g/mol, nitrogen (N) is approximately 14.01 g/mol, oxygen (O) is approximately 16.00 g/mol, and hydrogen (H) is approximately 1.01 g/mol.
Now, let's calculate the relative formula mass (RFM):
RFM = (2 x atomic mass of Cu) + (2 x atomic mass of N) + (6 x atomic mass of O)
RFM = (2 x 63.55) + (2 x 14.01) + (6 x 16.00)
RFM = 127.10 + 28.02 + 96.00
RFM = 251.12 g/mol
Therefore, the relative formula mass of 2Cu(NO3)2 is 251.12 g/mol.