A pair of students performs an experiment in which they collect 27 g CaO from the decomposition of 41 g CaCO3. Are these results reasonable? Explain your answer using percentage yield.

41 g CaCO3 should produce how much CaO?

%CaO in CaCO3 = (56/100)*100 = 56%.
So 41 g CaCO3 should produce 41*0.56 = about 23 g CaO. The students collected 27 grams. Does that sound reasonable to you. What would their percent yield be?

what is my percent yiel if i had 1.46 grams of copper to start with and ended with 2. 47 grams of copper?

swagg

To determine if the results are reasonable, we can calculate the percentage yield of the experiment.

Percentage yield is a measure of how much actual product is obtained compared to the theoretical yield, expressed as a percentage.

Here's how to calculate the percentage yield:

1. Determine the theoretical yield: The theoretical yield is the maximum amount of product that can be obtained in an ideal situation. In this case, the theoretical yield of CaO can be calculated by using the balanced chemical equation for the decomposition of CaCO3:

CaCO3 -> CaO + CO2

The molar mass of CaCO3 is 100.09 g/mol, and the molar mass of CaO is 56.08 g/mol. Therefore, we can calculate the theoretical yield as follows:

Theoretical yield = (mass of CaCO3 / molar mass of CaCO3) x (molar mass of CaO / molar mass of CaCO3)
= (41 g / 100.09 g/mol) x (56.08 g/mol / 100.09 g/mol)
= 0.4099 mol x 56.08 g/mol
= 22.974 g

2. Calculate the actual yield: The actual yield is the amount of product obtained in the experiment. In this case, the actual yield of CaO is given as 27 g.

3. Calculate the percentage yield: The percentage yield can be calculated using the formula:

Percentage yield = (actual yield / theoretical yield) x 100

Percentage yield = (27 g / 22.974 g) x 100
= 117.61%

The calculated percentage yield is greater than 100%, which means the actual yield is greater than the theoretical yield. In an ideal situation, the maximum yield should be 100%, but in practice, it is possible to obtain more than the theoretical yield due to various factors, such as experimental errors or incomplete reactions.

Based on the calculated percentage yield of 117.61%, it suggests that the experiment produced a higher yield of CaO than expected. Therefore, the results appear to be reasonable, although it is essential to consider possible sources of error and evaluate the experimental procedure.

abue