3 years ago

What is the percentage by mass of nacl in a saturated solution of sodium chloride at 50c

Chemistry

1 answer:

Flura [38]3 years ago

7 0

<span>27% thats it ^ u ^ yeah</span>

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What happens to an object's temperature if the kinetic energy of its particles decrease

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The temperature decreases

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3 years ago

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. how much calcium is contained in 45.0 g of c

kolbaska11 [484]

In a sample of pure calcium fluoride of mass 15.0 g, 7.70 g of calcium is present. First convert the mass into number of moles as follows:

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

Here, m is mass and M is molar mass.

Molar mass of Ca is 40 g/mol, putting the values,

$n=\frac{7.70 g}{40 g/mol}=0.1925 mol$

Similarly, molar mass of $CaF_{2}$ is 78.07 g/mol thus, number of moles will be:

$n=\frac{15.0 g}{78.07 g/mol}=0.1921 mol$ .

Thus, 0.1921 mol of $CaF_{2}$ have 0.1925 mol of Ca, or 1 mole of $CaF_{2}$ will have approximately 1 mole of Ca.

Now, mass of Ca needs to be calculated in 45.0 g of $CaF_{2}$ . Converting mass into number of moles first,

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Thus, number of moles of Ca will also be 0.5764 mol, converting number of moles into mass,

$m=n\times M=0.5764 mol\times 40 g/mol=23.06 g$

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6 0

2 years ago

What structural features help us identify a compound as an alkane, a cycloalkane, an alkene, an alkyne, a saturated hydrocarbon

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1. Cycloalkane
2. Alkene
3. Saturated Hydrocarbon
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if some of the Mg ribbon had not reacted because it stuck to the side of the tube and did not contact the acid, how would this h

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Answer:

For chemical reactions involving gases, gas volume measurements provide a convenient means of determining stoichiometric relationships.

Explanation:

Hope this helps! ∩ω∩

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2 years ago