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3 years ago

What are metalloids used for

1 answer:

8 0

Since metalloids share qualities of metals and nonmetals, they can be used to alloy (mix) metals.
Also used to make semiconductors.

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What type of solution has a pH of 7?

motikmotik

If pH+ is 7
It is Neutral solution

5 0

4 years ago

A 0.870 g sample of a monoprotic acid is dissolved in water and titrated with 0.300 M KOH.

Vedmedyk [2.9K]

<u>Answer:</u> The molar mass of monoprotic acid is 126.1 g/mol

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$

Molarity of KOH solution = 0.300 M

Volume of solution = 23.00 mL

Putting values in above equation, we get:

$0.300M=\frac{\text{Moles of KOH}\times 1000}{23.00}\\\\\text{Moles of KOH}=\frac{0.300\times 23.00}{1000}=0.0069moles$

The chemical equation for the reaction of monoprotic acid and KOH follows:

$HA+KOH\rightarrow KA+H_2O$

By Stoichiometry of the reaction:

1 mole of KOH reacts with 1 mole of HA

So, 0.0069 moles of KOH will react with = $\frac{1}{1}\times 0.0069=0.0069$ moles of HA

To calculate the molar mass for given number of moles, we use the equation:

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

Given mass of HA = 0.870 g

Moles of monoprotic acid = 0.0069 mol

Putting values in above equation, we get:

$0.0069mol=\frac{0.870g}{\text{Molar mass of monoprotic acid}}\\\\\text{Molar mass of monoprotic acid}=\frac{0.870g}{0.0069mol}=126.1g/mol$

Hence, the molar mass of monoprotic acid is 126.1 g/mol

3 0

3 years ago

Choose the options below that are true of a solution of a solid in a liquid. (select all that apply) Select all that apply: Most

Alekssandra [29.7K]

Answer:

Most solids in solution exhibit a general trend of increasing solubility with increasing temperature.

A seed crystal may be added to a supersaturated solution to precipitate excess solute.

Explanation:

For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions(Lumen Learning).

When a seed crystal is added to a supersaturated solution, excess solute begin to precipitate because the seed crystal now furnishes the required nucleation site where the excess dissolved crystals now begin to grow.

6 0

3 years ago

What is the pressure in arm exerted by 2.48 miles of gas in 250.0 mL container at 58

konstantin123 [22]

Answer:

T = 58 + 273.15 = 331.15

R = 0.082 atm

V = 250.0 mL / 1000 = 0.25 L

P = n x R x T / V

P = 2.48 x 0.082 x 331.15 / 0.25

P = 67.342 / 0.25

P = 269.368 atm

Explanation:

5 0

3 years ago

What is the combined gas law formula ?

Lera25 [3.4K]

P = pressure, V = volume, T = absolute temperature k = constant.

4 0

3 years ago

Read 2 more answers