how many grams does 0.500 moles of CuBr weigh?
Usng the relative atomic masses calculate the molecular mass for CuBr. This is the mass for one mole. I would use RAMs to at least 3 sig figs because 0.500 is to 3 sig figs.
Hence calculate the mass for 0.500 moles, bearing in mind the number of significant figures in 0.500.
To determine the weight of 0.500 moles of CuBr, you need to use the molar mass of CuBr and convert moles to grams. Here are the steps to calculate it:
1. Find the molar mass of CuBr:
- The atomic mass of copper (Cu) is 63.55 g/mol.
- The atomic mass of bromine (Br) is 79.90 g/mol.
- CuBr consists of one copper atom and one bromine atom, so the molar mass of CuBr is:
Molar mass of CuBr = Atomic mass of Cu + Atomic mass of Br
2. Calculate the molar mass of CuBr:
- Molar mass of CuBr = 63.55 g/mol + 79.90 g/mol
3. Convert moles to grams:
- Multiply the number of moles (0.500) by the molar mass of CuBr:
Weight of CuBr = Number of moles × Molar mass of CuBr
- Substitute the values:
Weight of CuBr = 0.500 mol × (63.55 g/mol + 79.90 g/mol)
4. Calculate the weight of CuBr:
Weight of CuBr = 0.500 mol × 143.45 g/mol
Weight of CuBr = 71.725 grams
Therefore, 0.500 moles of CuBr weighs 71.725 grams.