Using the mass of the copper in the crucible (first mass in the table), and the mass of the crucible with compound (last mass you measured), calculate the mass of sulfur present in your product. Then find the percentage (by mass) of copper and the percentage (by mass) of sulfur in the product.
so far I have,
Initial crucible weight w/ copper = 17.914 g
Mass of crucible w/ compound = 18.001 g
So we have the 0.087 g of sulfur.
How would I find the percentages (by mass) if I were to attempt this?
Would i need the empirical formula of this compound to further solve this? What is the equation I would use? Thank you!!
How much Cu did you have?
%Cu = (mass Cu/mass copper sulfide)*100 = ?
% S = (mass S/mass copper sulfide)*100 = ?
That makes sense. I was missing that value. The weight of Cu would be 0.309 g. That is how much I have.
So,
%Cu = (0.309/0.087) x 100 ?
Are those the right values?
Wait, that's how I would get sulfur right? The %Suflur=(0.309/0.087) x100?
Which value would I use for Cu?
Neither one is correct.
Mass Cu = 0.309
mass S = 0.087
mass compound is 0.309 + 0.087 = 0.396
%Cu = (0.309/0.396)*100 = ? etc
To find the percentage (by mass) of copper and sulfur in the compound, you can use the following steps:
1. Calculate the mass of sulfur present in the compound:
Mass of sulfur = Mass of crucible with compound - Initial crucible weight with copper
= 18.001 g - 17.914 g
= 0.087 g
2. Calculate the total mass of the compound:
Total mass of compound = Mass of crucible with compound - Initial crucible weight
= 18.001 g - 17.914 g + mass of sulfur
= 0.087 g + mass of sulfur
3. Calculate the percentage (by mass) of copper:
Percentage of copper = (Mass of copper / Total mass of compound) x 100
4. Calculate the percentage (by mass) of sulfur:
Percentage of sulfur = (Mass of sulfur / Total mass of compound) x 100
To determine the empirical formula of the compound, you would need additional information such as the molar masses of copper and sulfur, the ratio between the two elements, or the molecular formula of the compound. However, based on the given information, you can only calculate the mass percentages of copper and sulfur in the compound.