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3 years ago

Can someone help please!

Chemistry

2 answers:

trasher [3.6K]3 years ago

7 0

Answer:

Mixtures

Explanation:

SIZIF [17.4K]3 years ago

6 0

Which of these are broken down during chemical, but not physical changes?

I am not so sure about this one... sorry

According to the periodic table of the elements, which set of elements has similar properties?

He, Ne, Ar have similar properties because there in the same group.

What is its mass number?

Beryllium's mass number is 9.

I am so sorry I wasn't able to answer the 1st question... but I hope I helped you.

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What is the molariity of a 50.0 mL aqueous solution containing 10.0 grams of acetic acid, CH3COOH

rosijanka [135]

Answer:

The molarity is 1.26

Explanation:

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3 years ago

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The concentrated sulfuric acid we use in the laboratory is 98.0% sulfuric acid by weight. Calculate the molality and molarity of

timama [110]

Answer : The molarity and molality of the solution is, 18.29 mole/L and 499.59 mole/Kg respectively.

Solution : Given,

Density of solution = $1.83g/cm^3=1.83g/ml$

Molar mass of sulfuric acid (solute) = 98.079 g/mole

98.0 % sulfuric acid by mass means that 98.0 gram of sulfuric acid is present in 100 g of solution.

Mass of sulfuric acid (solute) = 98.0 g

Mass of solution = 100 g

Mass of solvent = Mass of solution - Mass of solute = 100 - 98.0 = 2 g

First we have to calculate the volume of solution.

$\text{Volume of solution}=\frac{\text{Mass of solution}}{\text{Density of solution}}=\frac{100g}{1.83g/ml}=54.64ml$

Now we have to calculate the molarity of solution.

$Molarity=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{volume of solution}}=\frac{98.0g\times 1000}{98.079g/mole\times 54.64ml}=18.29mole/L$

Now we have to calculate the molality of the solution.

$Molality=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent}}=\frac{98.0g\times 1000}{98.079g/mole\times 2g}=499.59mole/Kg$

Therefore, the molarity and molality of the solution is, 18.29 mole/L and 499.59 mole/Kg respectively.

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3 years ago

How ph relate with poh

mylen [45]

The "p" in pH and pOH stands for "negative logarithm of" and is used to make it easier to work with extremely large or small values. pH and pOH are only meaningful when applied to aqueous (water-based) solutions.

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3 years ago

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Calculate the mass in grams in nine molecules of CH3COOH? Please show how you got your answer.

WINSTONCH [101]

M CH₃COOH: 12u×2 + 1u×4 + 16u×2 = 60u

m 9CH₃COOH: 60u×9 = 540u

(1u ≈ 1,66·10⁻²⁴g)
-----------------------------
1u ------- 1,66·10⁻²⁴g
540u ---- X
X = 540×1,66·10⁻²⁴g
X = 896,4·10⁻²⁴g

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3 years ago

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Vinil7 [7]

The answer is b
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