A protein found in some types of wood-rotting fungi is 0.40% copper by mass. Each protein molecule is known to contain 4 copper atoms. What is the approximate molecular weight of thos compound?
See your post above.
To find the approximate molecular weight of the compound, we need the following information:
1. The percentage of copper by mass (0.40%).
2. The number of copper atoms in each protein molecule (4).
First, let's assume we have a 100 gram sample of the compound. From the given information, we know that 0.40% of these 100 grams is copper. We can calculate the mass of copper in the sample as follows:
Mass of copper = 0.40% of 100g
= (0.40/100) * 100g
= 0.40g
Since each protein molecule contains 4 copper atoms, we can find the molar mass of copper and use it to calculate the number of moles:
Molar mass of copper = atomic mass of copper
= 63.546 g/mol (approximately)
Number of moles of copper = Mass of copper / Molar mass of copper
= 0.40g / 63.546 g/mol
= 0.0063 mol (approximately)
Since there are 4 copper atoms per molecule, the number of molecules of the compound is:
Number of molecules of the compound = Number of moles of copper / 4
= 0.0063 mol / 4
= 0.0016 mol (approximately)
To calculate the molecular weight of the compound, we need to know the total mass of the compound. We have assumed a 100g sample, so the mass of the compound is also 100g.
Molecular weight of the compound = Mass of the compound / Number of molecules of the compound
= 100g / 0.0016 mol
= 62,500 g/mol
Therefore, the approximate molecular weight of the compound is 62,500 g/mol.