Is solid phosphorus a conductor or an insulator
2 answers:
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Nikola's reading has a lower range and it is logical to conclude that his reading is more precise.
Explanation:
Precision is the ability to reproduce the same set of result from a measurement. The more repeatability a measurement is, the more precise it is.
From the given pool of data, it is easy to determine which set of data is more precise over the other.
Thomas measurements: 10.0 A, 11 A, and 8 A
Nikola measurements: 9.0 A, 9.2 A, 8.8 A
Using the range method, it is possible to find the precision in this pool of data.
Method and Solution:
Find the range of the sample:
Range = highest value - lowest value
Thomas measurement; Range = (11-8)A = 3.0A
Nikola measurement; Range = (9.2-8.8)A = 0.4A
Find the mean of the samples:
Mean of Thomas measurement = =
= 9.7A
Mean of Nikola measurement = =
= 9A
Now let us quote the range of value of the mean of each measurement:
Thomas 9.7±3.0A
Nikola 9.0± 0.4A
Nikola's reading has a lower range and it is logical to conclude that his reading is more precise.
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<u>Answer:</u> The excess reagent for the given chemical reaction is calcium hydroxide and the amount left after the completion of reaction is 0.115375 moles. The amount of calcium chloride formed in the reaction is 1.068 grams.
<u>Explanation:</u>
- To calculate the number of moles, we use the equation:
....(1)
<u>For calcium hydroxide:</u>
Given mass of calcium hydroxide = 9.27 g
Molar mass of calcium hydroxide = 74.093 g/mol
Putting values in above equation, we get:
- To calculate the moles of a solute, we use the equation:
We are given:
Volume of hydrochloric acid = 38.5mL = 0.0385 L (Conversion factor: 1 L = 1000 mL)
Molarity of the solution = 0.500 moles/ L
Putting values in above equation, we get:
- For the given chemical equation:
Here, the solid salt is calcium chloride.
By Stoichiometry of the reaction:
2 moles of hydrochloric acid reacts with 1 mole of calcium hydroxide.
So, 0.01925 moles of hydrochloric acid will react with = of calcium hydroxide.
As, given amount of calcium hydroxide is more than the required amount. So, it is considered as an excess reagent.
Thus, hydrochloric acid is considered as a limiting reagent because it limits the formation of product.
- Amount of excess reagent (calcium hydroxide) left = 0.125 - 0.01925 = 0.115375 moles
By Stoichiometry of the reaction:
2 moles of hydrochloric acid produces 1 mole of calcium chloride.
So, 0.01925 moles of hydrochloric acid will produce = of calcium chloride.
Now, calculating the mass of calcium chloride from equation 1, we get:
Molar mass of calcium chloride = 110.98 g/mol
Moles of calcium chloride = 0.009625 moles
Putting values in equation 1, we get:
Hence, the excess reagent for the given chemical reaction is calcium hydroxide and the amount left after the completion of reaction is 0.115375 moles. The amount of calcium chloride formed in the reaction is 1.068 grams.