Q1.A compound of copper and sulphur is 65.43percent copper by mass.how many grams of copper can be obtained from 249g of this compound?and how many grams of sulphur remain?
Here is a worked example of a stoichiometry problem.
http://www.jiskha.com/science/chemistry/stoichiometry.html
But you can do it a lot faster another way.
249g copper sulfide x 0.6543 = g Cu that can be obtained.
S = 34.57 S and 249 x 0.3457 = g S in the 249 g.
To calculate the amount of copper that can be obtained from 249g of the compound, first, we need to determine the mass of copper in the compound.
Given:
- The compound is 65.43% copper by mass.
- The compound weighs 249g.
Step 1: Calculate the mass of copper in the compound.
Mass of copper = percentage of copper × mass of compound
Mass of copper = 65.43% × 249g
Mass of copper = (65.43/100) × 249g
Mass of copper = 163.04607g
Therefore, 163.04607g of copper can be obtained from 249g of the compound.
Step 2: Calculate the mass of sulfur remaining in the compound.
Mass of sulfur = Total mass of the compound - Mass of copper
Mass of sulfur = 249g - 163.04607g
Mass of sulfur = 85.953933g
Therefore, 85.953933g of sulfur will remain in the compound.
To find out how many grams of copper can be obtained from the compound, we first need to determine the mass of the compound that consists of copper.
Step 1: Calculate the mass of the compound containing copper.
Given that the compound is 65.43% copper by mass, we can calculate the mass of the compound as follows:
Mass of compound = Percentage of copper × Mass of compound
= 65.43% × 249g
= (65.43/100) × 249g
= 163.00407g
Therefore, the mass of the compound containing copper is approximately 163.00407 grams.
Step 2: Calculate the mass of copper.
Since the percentage is calculated based on the mass, we can determine the mass of copper in the compound using the following equation:
Mass of copper = Percentage of copper × Mass of compound
= 65.43% × 163.00407g
= (65.43/100) × 163.00407g
= 106.5975g
Therefore, approximately 106.5975 grams of copper can be obtained from 249 grams of the compound.
Step 3: Calculate the mass of sulfur.
To find out how many grams of sulfur remain, we need to subtract the mass of copper from the initial mass of the compound:
Mass of sulfur = Mass of compound - Mass of copper
= 163.00407g - 106.5975g
= 56.40657g
Therefore, approximately 56.40657 grams of sulfur remain.
The copper obtained from 249 grams of the compound is approximately 106.5975 grams, and approximately 56.40657 grams of sulfur remain.