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dsp73
2 years ago
5

what safety rule does not apply to the organic chemistry laboratory? no eating, drinking, or smoking in the laboratory. wear pro

per clothing at all times. wear enclosed safety goggles at all times while in the laboratory. follow all safety instructions in the laboratory text or given by the teaching assistant. none of the choices are correct.
Chemistry
1 answer:
Vedmedyk [2.9K]2 years ago
6 0

Safety rules are the regulatory actions that need to be followed to prevent any danger. Following all safety instructions in laboratory text or by assistant does not apply in an organic chemistry lab. Thus, option D is correct.

<h3>What are laboratory safety rules?</h3>

Laboratory safety rules are the guidelines that are supposed to be followed by the person working in the laboratory while performing the experiments. While working in the organic chemistry lab one should never remove the equipment.

One should wear safety goggles and should not perform the experiments in absence of a teaching assistant. But it is not necessary to follow all the rules in the laboratory textbook.

Therefore, in option D. all rules of the information textbook are not necessary to be followed.

Learn more about laboratory safety, here:

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A 2.684-g sample of zinc oxide was reduced by hydrogen gas, resulting in 2. 156 g of pure zinc metal. Determine the empirical fo
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The empirical formula of the initial zinc oxide is ZnO.

<h3>What is Empirical Formula?</h3>

The empirical formula of a compound represents the ratios of elements in a compound but not the actual numbers or arrangement of the atoms.

It is the lowest whole number ratio of the element in the compound.

<h3>How to find out the empirical formula?</h3>
  • Find out the given masses and molar masses of the elements

The molar mass of Zn = 65 gmol⁻¹

Given the mass of Zn = 2.156 g

The molar mass of Oxygen = 16 gmol⁻¹

The mass of Oxygen = Mass of a sample of zinc oxide - the mass of zinc metal

                                   = (2.684 - 2.156) g

                                   = 0.528 g

  • Find the number of moles of the elements in the compound

The number of moles is given by

n = \frac{m}{M}

where m = given mass and

M = Molar mass

Number of moles of Zinc = \frac{2.156}{65} = 0.033 moles

Number of moles of Oxygen =\frac{0.528}{16} = 0.033 moles

  • Find the simplest ratios of the elements in the compound. To find the ratios simply divide the number of moles by the lowest number of moles obtained.

Here, the number of moles is the same for both elements. Hence, the simplest ratio for Zn:O is 1:1.

Therefore, the empirical formula of zinc oxide is ZnO.

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