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3 years ago

Find the temperature from 150ml cylinder containing 0.75 moles gas at 153kpa.

1 answer:

6 0

To find the temperature in the problem, we apply the ideal gas law, PV=nRT where R=8.314 Pam3/mol K. Substituting the given, T= 153,000 Pa*1.5x10^-4 m3/ [(0.75 mol)(8.314 Pam3/mol K)]. The temperature is equal to 3.68 kelvin.

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How many moles of atoms oxygen are in 4.92x10^24 molecules of KNO2?

Nana76 [90]

Answer:

8.17

Explanation:

from

N=n×La

n=N/La

n=4.92×10^24/6.022×10^23

n= 8.17 moles

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3 years ago

A government laboratory wants to determine whether water in a certain city has any traces of fluoride and whether the concentrat

nexus9112 [7]

Answer: The given sample of water is not safe for drinking.

Explanation:

We are given:

Concentration of fluorine in water recommended = 4.00 ppm

ppm is the amount of solute (in milligrams) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of fluorine in water, we use the equation:

$\text{ppm}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 10^6$

Both the masses are in grams.

We are given:

Mass of fluorine = $0.152mg=0.152\times 10^{-3}g$ (Conversion factor: 1 g = 1000 mg)

Mass of water = 5.00 g

Putting values in above equation, we get:

$\text{ppm of fluorine in water}=\frac{0.152\times 10^{-3}}{5}\times 10^6\\\\\text{ppm of fluorine in water}=30.4$

As, the calculated concentration is greater than the recommended concentration. So, the given sample of water is not safe for drinking.

Hence, the given sample of water is not safe for drinking.

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3 years ago

How many significant figures are in 0.0034 cm? a 2 b 3 c 1 d 4

Annette [7]

Answer:

A. 2 sig figs

Explanation:

In the number 0.0034, the zeros are called leading zeros. The only function of leading zeros is to fix the decimal point. Leading zeros are not counted as significant figures.

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4 years ago

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Viktor [21]

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Explanation:

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4 years ago

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guapka [62]

Answer:

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3 years ago