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tatiyna
3 years ago
7

1. Working in the laboratory, a student find the density of a piece of pure aluminum to be 2.85

Chemistry
1 answer:
dsp733 years ago
4 0

Answer:

5.59 %

Explanation:

From the question given above, the following data were obtained:

Observed value of density = 2.85 g/cm³

True value of density = 2.699 g/cm³

Percentage error =.?

The percentage error of the student can be obtained as follow:

Percentage error = |Observed value – True value|/True value × 100

Percentage error = |2.85 – 2.699|/2.699

Percentage error = 0.151/2.699 × 100

Percentage error = 5.59 %

Therefore, the percentage error of the student is 5.59 %.

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Calculate the volume of a 0.5M solution containing 20g of NaOH
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Answer:

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Explanation:

First, let us calculate the number of mole present in 20g of NaOH. This is illustrated below:

Mass = 20g

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Number of mole = Mass /Molar Mass

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From the question given, we obtained the following data:

Molarity = 0.5M

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A bottle of coke is 250.0 mL. What is the volume in cubic centimeters?
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Answer:

The volume in cubic centimeters is 250

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

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