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3 years ago

When adding or subtracting deelmals, how many digits should the answer contain?

Chemistry

1 answer:

Alexus [3.1K]3 years ago

5 0

Answer:

Depends, but in most cases, 2.

It's best to use as many digits as possible to keep it accurate.

Explanation:

This varies between teachers, as most schools go with 2 decimal places.

This is something that depends in your situation.

You technically want as many decimals as possible to keep it as accurate, but most people stick with 2.

I personally do 3, and commonly do 5 sometimes.

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What is it about water that makes it able to dissolve both polar covalent and iconic substances

GREYUIT [131]

Answer:

A solvent is simply a substance that can dissolve other molecules and compounds, which are known as solutes. ... Because of its polarity and ability to form hydrogen bonds, water makes an excellent solvent, meaning that it can dissolve many different kinds of molecules.

Explanation:

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3 years ago

A volatile organic liquid with known molecular weight is added to a vapor density flask which has a known volume. The flask is h

kakasveta [241]

Answer: Mass of the condensed vapor is 21.35 grams.

Explanation: As a gas, the Ideal Gas Law can be used to determine how many mols there are in the flask on the conditions described in question.

Temperature in K: 273 + 99.3 = 372.4K

Pressure in mmHg: P = 760.5 mmHg

Volume in L: V = 496.3. $10^{-3}$ = 0.5 L

Universal Constant of Gases in mmHg: R = 62.36 L.mmHg.K⁻¹.mol⁻¹

PV = nRT

n = $\frac{PV}{RT}$

n = $\frac{760.5.0.5}{62.36.372.4}$

n = 0.1625

To determine the mass in grams:

n = $\frac{m}{M}$

m = nM

m = 0.1625.131.4

m = 21.35

On the conditions cited above, there are <u>21.35 grams</u> of the unknown condensed vapor

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siniylev [52]

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