2Cu+S→Cu2S
1 answer:
15.9 grams is the amount of copper sulfate this reaction will produce.
Given:
- The reaction between copper and sulfur:
- 12.7 grams of copper completely reacts with 3.2 grams of sulfur to give copper sulfide.
To find:
The mass of copper sulfide produced
Solution
Mass of copper used by the scientist = 12.7 g
Mass of sulfur used by the scientist = 3.2 g
Mass of copper sulfide this reaction will produce. =?
According to the law of conservation of mass:
Total mass of reactants = Total mass of products
The total mass of reactants in the reaction = R = 12.7 g + 3.2 g = 15.9 g
The total mass of product formed in the reaction = P
P = R = 15.9 g
Mass of copper sulfide this reaction will produce = 15.9 g
15.9 grams is the amount of copper sulfate this reaction will produce.
Learn more about the law of conservation of mass:
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Answer:
The cuvette will only fit into the spectrophotometer in one orientation.
Explanation:
There is an arrow always marked on the cuvette that indicates how to place it inside the spectrophotometer. The sides of the cuvette also have small edges that if light passes through them, spurious light can be detected due to poor positioning. The spurious light does not get through the entire sample, if we want to measure the absorbance. With a cuvette in the indicated position, the procedure is measured and its reference value is taken, and then compared with other cuvettes to be used.
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