In a certain compound of copper and oxygen, a sample weighing 0.5424 g contains 0.4831 g Cu. How many moles of copper are in the sample and the mass of oxygen in the sample?
moles Cu = grams Cu/atomic mass Cu.
g oxygen = mass sample - mass Cu
To determine the number of moles of copper in the sample, we can use the molar mass of copper (Cu) and the given mass of copper.
The molar mass of copper (Cu) is 63.55 g/mol.
First, we calculate the number of moles of copper in the sample:
moles of Cu = mass of Cu / molar mass of Cu
moles of Cu = 0.4831 g / 63.55 g/mol
moles of Cu = 0.007607 mol
Therefore, there are approximately 0.007607 moles of copper in the sample.
To find the mass of oxygen in the sample, we need to consider the total mass of the sample and subtract the mass of copper.
Total mass of the sample = 0.5424 g
Mass of oxygen = Total mass of the sample - Mass of copper
Mass of oxygen = 0.5424 g - 0.4831 g
Mass of oxygen = 0.0593 g
Therefore, the sample contains approximately 0.007607 moles of copper and the mass of oxygen in the sample is approximately 0.0593 g.