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3 years ago

A 0.600-L sample of a 3.75M solution of potassium iodide (KI) contains what mass of KI?

1 answer:

3 0

the molarity of a solution made by dissolving 5.67 g of potassium chloride in enough water to make 100.0 mL of solution.

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How many atoms are in 87.1 g of nickel?

devlian [24]

The exact answer is 511.219514

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3 years ago

If 16.9 kg of Al2O3(s), 57.4 kg of NaOH(l), and 57.4 kg of HF(g) react completely, how many kilograms of cryolite will be produc

hodyreva [135]

Answer: 69.72 kg of cryolite will be produced.

Explanation:

The balanced chemical equation is:

$Al_2O_3(s)+6NaOH(l)+12HF(g)\rightarrow 2Na_3AlF_6+9H_2O$

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

moles of $Al_2O_3$ = $\frac{16.9\times 1000g}{102g/mol}=165.7moles$

moles of $NaOH$ = $\frac{57.4\times 1000g}{40g/mol}=1435moles$

moles of $HF$ = $\frac{57.4\times 1000g}{20g/mol}=2870moles$

As 1 mole of $Al_2O_3$ reacts with 6 moles of $NaOH$

166 moles of $Al_2O_3$ reacts with = $\frac{6}{1}\times 166=996$ moles of $NaOH$

As 1 mole of $Al_2O_3$ reacts with 12 moles of $HF$

166 moles of $Al_2O_3$ reacts with = $\frac{12}{1}\times 166=1992$ moles of $HF$

Thus $Al_2O_3$ is the limiting reagent.

As 1 mole of $Al_2O_3$ produces = 2 moles of cryolite

166 moles of $Al_2O_3$ reacts with = $\frac{2}{1}\times 166=332$ moles of cryolite

Mass of cryolite $(Na_3AlF_6)$ = $moles\times {\text {molar mass}}=332mol\times 210g/mol=69720g=69.72kg$

Thus 69.72 kg of cryolite will be produced.

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3 years ago

Draw two cyclic constitutional isomers of cis-1-chloro-2-methylcyclobutane with the same size ring. In cases where there is only

igomit [66]

Answer:

The drawings are in the figure attached below.

Explanation:

"Constitutional isomers" is a term used in chemistry to refer to chemical compounds that have the same constitution and molecular formula distributed in a different structure. That is, the compound has the same atoms, but when built in a three-dimensional image, these atoms occupy different places within the same structure.

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3 years ago

Light waves from the Sun can be converted to electricity through

katrin [286]

Hi , the answer is solar panels .

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3 years ago

What happens to the concentration of NO₂(g) when the total pressure on the equilibrium reaction <img src="https://tex.z-dn.net/?

zepelin [54]

Answer:

Explanation:

To adequately account for what happens to volume when pressure is increased, we need to know exactly the type of volume change that occurred. Now as we can see, there is a volume change from 2 moles to 7 moles.

This shows an increase in volume. To favor the forward reaction, there should be a decrease in the volume which is unfortunately not the case here. Hence it’s the backward reaction that would be favored.

Since the formation of NO2 is in the forward reaction, then, we can see that its concentration will decrease

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3 years ago