In a certain compound of copper and oxygen, a sample weighing 0.5424g contains 0.4831 g of Cu. How many moles of Cu in the sample? How many grams of Oxygen and how many moles of Oxygen are there in the sample? What is the mole ratio of Cu/O in the sample? What is the formula of the oxide and the molar mass of thye copper oxide?
mols Cu = g/atomic mass
g O = 0.5424 g total - 0.4831g Cu
mols O = g O/atomic mass O.
Find the ratio with the smallest number being 1.00; the easy way to do that is to divide the smallest number by itself, then divide the other number by the same small number. Post your work if you get stuck.
Well, well, well, looks like Copper and Oxygen decided to have a compound party! Let's crunch some numbers, shall we?
To find the number of moles of copper in the sample, we divide the given mass of copper by the molar mass of copper (63.55 g/mol). So, 0.4831 g Cu / 63.55 g/mol = 0.0076 mol Cu.
Now, let's find the grams of oxygen in the sample. We subtract the mass of copper from the total sample mass. That gives us 0.5424 g - 0.4831 g = 0.0593 g O.
To find the number of moles of oxygen, we divide the mass of oxygen by the molar mass of oxygen (which is 16.00 g/mol). So, 0.0593 g O / 16.00 g/mol = 0.0037 mol O.
Now, let's talk about the mole ratio of Cu/O in the sample. From the chemical formula of copper oxide, we know that the ratio is 1:1. So, for every mole of copper, we have one mole of oxygen. It's like a copper-oxygen buddy system!
Speaking of formulas, the formula of the oxide is CuO, because we have one copper atom bonding with one oxygen atom. If they had a party, that's the formula they would choose!
Finally, let's calculate the molar mass of copper oxide. The molar mass of copper is 63.55 g/mol, and the molar mass of oxygen is 16.00 g/mol. So, the molar mass of CuO would be 63.55 g/mol + 16.00 g/mol = 79.55 g/mol.
So to sum it all up: there are 0.0076 moles of Cu, 0.0593 grams of O, 0.0037 moles of O, a 1:1 mole ratio of Cu/O, and the formula is CuO with a molar mass of 79.55 g/mol.
Hope that answers your question and puts a smile on your face!
To find the number of moles of Cu in the sample, we can use the atomic mass of Cu.
1. Find the molar mass of Cu.
The atomic mass of Cu is 63.55 g/mol.
2. Calculate the number of moles of Cu.
moles of Cu = mass of Cu / molar mass of Cu
moles of Cu = 0.4831 g / 63.55 g/mol
The number of moles of Cu in the sample is approximately 0.0076 moles.
To find the number of grams and moles of oxygen in the sample, we need to subtract the mass of copper from the total sample mass.
3. Calculate the mass of oxygen.
mass of O = total sample mass - mass of Cu
mass of O = 0.5424 g - 0.4831 g
The mass of oxygen in the sample is approximately 0.0593 g.
4. Calculate the moles of oxygen.
moles of O = mass of O / molar mass of O
moles of O = 0.0593 g / molar mass of O
Unfortunately, the molar mass of oxygen is missing from the given information, so we cannot determine the number of moles of oxygen without this value.
To find the mole ratio of Cu/O in the sample, we need to compare the number of moles of Cu to the number of moles of O.
5. Calculate the mole ratio of Cu/O.
mole ratio of Cu/O = moles of Cu / moles of O
mole ratio of Cu/O = 0.0076 moles / moles of O
Again, without knowing the number of moles of oxygen, we cannot determine the mole ratio.
To deduce the formula of the oxide and the molar mass of the copper oxide, we need to consider the stoichiometry of the reaction.
6. Write the balanced equation for the formation of the oxide.
Cu + O2 -> CuO
Based on this equation, we can infer that 1 mole of Cu reacts with 1 mole of O2 to form 1 mole of CuO.
Therefore, the formula of the oxide is CuO, and the molar mass can be calculated as follows:
- Molar mass of Cu: 63.55 g/mol
- Molar mass of O: missing
- Molar mass of CuO: molar mass of Cu + molar mass of O
Unfortunately, without knowing the molar mass of oxygen, we cannot determine the molar mass of the copper oxide.
To find the number of moles of Cu in the sample, you need to use the molar mass of copper (Cu), which is 63.55 g/mol.
First, you need to calculate the number of moles of Cu in the sample. To do this, divide the given mass of Cu (0.4831 g) by the molar mass of Cu (63.55 g/mol):
moles of Cu = 0.4831 g / 63.55 g/mol ≈ 0.0076 mol
So, there are approximately 0.0076 moles of Cu in the sample.
Next, to find the mass of oxygen (O), you need to subtract the mass of Cu from the mass of the entire compound.
mass of O = mass of compound - mass of Cu = 0.5424 g - 0.4831 g = 0.0593 g
Now, to calculate the number of moles of O in the sample, you need to use the molar mass of oxygen (O), which is 16.00 g/mol. Divide the mass of O (0.0593 g) by the molar mass of O (16.00 g/mol):
moles of O = 0.0593 g / 16.00 g/mol ≈ 0.0037 mol
So, there are approximately 0.0037 moles of O in the sample.
To find the mole ratio of Cu/O in the sample, you need to divide the number of moles of Cu by the number of moles of O:
mole ratio of Cu/O = moles of Cu / moles of O = 0.0076 mol / 0.0037 mol ≈ 2.05
So, the mole ratio of Cu/O in the sample is approximately 2.05.
Now, to determine the formula of the oxide and the molar mass of the copper oxide, you need to use the mole ratio.
Since the mole ratio of Cu/O is approximately 2.05, we can write the formula of the oxide as Cu2O.
To calculate the molar mass of Cu2O, you need to sum the atomic masses of the elements in the formula:
2 x atomic mass of Cu + 1 x atomic mass of O = 2 x 63.55 + 16.00 = 143.10 g/mol
Therefore, the formula of the oxide is Cu2O and the molar mass of the copper oxide is approximately 143.10 g/mol.