3 years ago

Which of the following showing the Law of Conservation of Mass?

Chemistry

2 answers:

Stells [14]3 years ago

7 0

The only one I know for sure is Mass is always conserved In a Chemical reaction.

sattari [20]3 years ago

6 0

Answer:

I'm pretty sure mass is always conserved during a chemical reaction.

Explanation:

Sorry for not answering the whole question.

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Xelga [282]

The circulatory system

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2 years ago

10: Convert 77.0 L at 18.0 mmHg to its new volume at standard pressure.

olchik [2.2K]

Answer:

The answer to your question is V2 = 1.82 l

Explanation:

Data

Volume 1 = 77 l

Pressure 1 = 18 mmHg

Volume 2 = ?

Pressure 2 = 760 mmHg

Process

Use Boyle's law to solve this problem

P1V1 = P2V2

-Solve for V2

V2 = P1V1/P2

-Substitution

V2 = (18 x 77) / 760

-Simplification

V2 = 1386 / 760

-Result

V2 = 1.82 l

5 0

3 years ago

Determine the percent water in MgSO4*7H20?

Semmy [17]

Answer:

$\% H_2O=51.2\%$

Explanation:

Hello!

In this case, since the percent water is computed by dividing the amount of water by the total mass of the hydrate; we infer we first need the molar mass of water and that of the hydrate as shown below:

$MM_{MgSO_4* 7H_2O}=120.36 g/mol+7*18.02g/mol\\\\MM_{MgSO_4* 7H_2O}=246.5g/mol$

Thus, the percent water is:

$\% H_2O=\frac{7*MM_{H_2O}}{MM_{MgSO_4* 7H_2O}} *100\%\\\\$

So we plug in to obtain:

$\% H_2O=\frac{7*18.02}{246.5} *100\%\\\\\% H_2O=51.2\%$

Best regards!

5 0

2 years ago

Does food cool faster after being in the microwave or being on the stove?

Simora [160]

Answer:

microwave...i think ._.

5 0

2 years ago

Do electrons have psrticle nature or wave nature?

densk [106]

Explanation:

they have wave nature

its correct answer

4 0

2 years ago