A 64.8 g mixture of the compounds potassium sulfide and calcium oxide is 17.1 % by mass potassium sulfide. The compound calcium oxide is 71.5 % by mass calcium. Calculate the mass (g) of oxygen in the mixture.
mass % = mass part/mass whole x 100.
I attempted the problem by subtracting 100 - 71.5 or 1 - .715 to get oxygen, and multiplied by the given mass. I'm stuck :(
To solve this problem, you need to use the concept of mass percent and the given information about the compounds present in the mixture. Here's a step-by-step guide to finding the mass of oxygen in the mixture:
Step 1: Calculate the mass of potassium sulfide in the mixture:
- Given: The mixture is 17.1% potassium sulfide by mass, and the total mass of the mixture is 64.8 g
- Mass of potassium sulfide = 17.1% × 64.8 g = 11.083 g
Step 2: Calculate the mass of calcium oxide in the mixture:
- Given: Calcium oxide is 71.5% calcium by mass, and the total mass of the mixture is 64.8 g
- Mass of calcium oxide = 71.5% × 64.8 g = 46.392 g
Step 3: Calculate the mass of oxygen in calcium oxide:
- Given: Calcium oxide is 71.5% calcium by mass
- Mass of calcium = 71.5% × mass of calcium oxide = 71.5% × 46.392 g = 33.193 g (approximately)
- Mass of oxygen = Mass of calcium oxide - Mass of calcium = 46.392 g - 33.193 g = 13.199 g (approximately)
Therefore, the mass of oxygen in the mixture is approximately 13.199 grams.