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Arlecino [84]
3 years ago
15

The density of copper is listed as 8.94g/cm​ 3​ . Two students each make three density determinations of samples of the substanc

e. Student A's results are 7.3g/mL, 9.4g/mL, and 8.3g/mL. Student B's results are 8.4g/cm​ 3​ , 8.8g/cm​ 3​ , 8.0g/cm​ 3​ . Compare the two sets of results in terms of precision and accuracy.
Chemistry
1 answer:
amm18123 years ago
5 0

Answer:

Density of the copper = 8.94g/cm^3

Student A results = 7.3gm/cm^3 ,9.4 gm/cm^3 , 8.3gm/cm^3

Student B results = 8.4 gm/cm^3 , 8.8 gm/cm^3 , 8gm/cm^3

From the observations we conclude that

Student A's result is accurate but not  precise as the trials noted are not close to each other.

Student B's result is accurate and precise as the trials noted are close to each other.

Mean density of student A = 7.3 + 9.4 + 8.3 /3 = 8.33gm/cm^3

Mean density of student B = 8.4 + 8.8 + 8 /3 = 8.4 gm/cm^3

both the densities of A and B are 0.5 away from the actual density.

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galina1969 [7]
Answer:
Molarity = 2.3 M

Explanation:
Molarity can be calculated using the following rule:
Molarity = number of moles of solute / volume of solution

1- getting the number of moles:
We are given that:
mass of solute = 105.96 grams
From the periodic table:
atomic mass of carbon = 12 grams
atomic mass of hydrogen = 1 gram
atomic mass of oxygen = 16 grams
Therefore:
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Now, we can get the number of moles as follows:
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2- The volume of solution is given = 1 liter

3- getting the molarity:
molarity = number of moles of solute / volume of solution
molarity = 2.3 / 1
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Hope this helps :)
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Notice that there are different amounts of N, O, and H on the left side and the right side.

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