if one can find the ratio of the number of moles of the elements in a compound to one another, one can find the formula of the compound. in certain compound of copper and oxygen, Cux Oy, we find that a sample weighing 0.5424g contains 0.4831g Cu.
a. How many moles of Cu are in the sample?
0.4831:63.546g/mol =.76 moles
b. How many grams of O are there in the sample? (the mass of the sample equals the mass of Cu plus the mass of O.)
mass O=0.6349- 0.431g Cu =0.1518g
c. how many moles of O are there in the sample?
If I divide 0.4831/63.54 I get something like 0.00776.
And g oxygen = mass sample-mass Cu = 0.5424-0.4831 = ??
moles oxygen = ??/32
To find the moles of O in the sample, we first need to find the molar mass of O.
Oxygen's atomic weight is 16.00 g/mol.
Therefore, 0.1518g of O is equal to 0.1518g / 16.00g/mol ≈ 0.0095 moles of O.
So, there are approximately 0.0095 moles of O in the sample of copper and oxygen compound.
To find the number of moles of oxygen (O) in the sample, we can use the molar mass of oxygen (16.00g/mol).
c. Number of moles of O = Mass of O / Molar Mass of O
Number of moles of O = 0.1518g / 16.00g/mol
Number of moles of O ≈ 0.0094875 mol
To find the moles of oxygen (O) in the sample, you can use the molar mass of oxygen and the mass of O in the sample.
Mass of O = 0.1518g
Molar mass of O = 16.00g/mol
To find the moles of oxygen, divide the mass of O by the molar mass of O:
Moles of O = Mass of O / Molar mass of O
Moles of O = 0.1518g / 16.00g/mol
Moles of O = 0.00949 mol (rounded to five decimal places)
So, there are approximately 0.00949 moles of oxygen in the sample.