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3 years ago

How do you convert the measured mass of a substance to moles?

2 answers:

7 0

To convert between mass and number of moles, you can use the molar mass of the substance.

Hope I helped : )

Sonja [21]3 years ago

6 0

Use the molar mass of an element or compound to convert between the mass of a substance and the moles of a substance

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Will upvote

damaskus [11]

I believe the correct answer from the choices listed above is the third option. A ball falling through the air has both potential energy because it still has a distance to move before it hits the ground and kinetic energy because it is moving. Hope this answers the question. Have a nice day.

6 0

3 years ago

Which of the following quantities is conserved in a chemical reaction

Nezavi [6.7K]

Answer:

In both nuclear and chemical reactions, two physical quantities are seen to be conserved and unchanging: the number of particles and the total charge. A constant number of particles in nuclear reactions does not imply that mass is conserved.

Explanation:

7 0

3 years ago

An experiment was conducted to determine the density of a rock sample. The table shows a partial record of the experiment.

mart [117]

Answer: the density of the rock

55.91g/ml

Explanation:

The density of the rock after it had being placed in the cylinder of water so the calculation should look like this:

Volume of water substract the mass of the rock:

And that is 142.5 ml - 86.59g =

Answer 55.91 g/ml

So the density of the rock is 55.91g/ml

5 0

2 years ago

Compounds A and B are constitutional isomers (same molecular formula but

Naily [24]

Answer:

Trimethylacetaldehyde

Explanation:

For the unknow compound we have a molar mass of 86 g/mol. We have an even value for the mass, so the compound does not have nitrogen and we can have several posibilities:

A) $C_3H_2O_3$

B) $C_4H_6O_2$

C) $C_5H_1_0O$

D) $C_6H_1_4$

If we check the IR info a signal in 1730 cm-1 appears, this indicates that we have an oxo group (C=O). So, the D option can be discarded. The groups that can have the oxo group are: Carboxylic acids, Ketones and aldehydes.

We don have a signal in 3000 cm-1, so the carboxylic acid can be discarded. Now, is we check the info for the 1H NMR we only have 2 signals. If we only have 2 we will have a very symmetric compound.

By trial an error the find the compound Trimethylacetaldehyde (Figure 1).

3 0

3 years ago

Calculate the number of molecules in 120 grams of water

marissa [1.9K]

7.02x $10^{24}$

4 0

3 years ago