The charge on an ion is known as its__

What volume (l) of 0.750 m kcl solution contains 25.0 g of kcl?

Effectus [21]

Conc = moles / Vol you have C but need to find moles
moles KCl = mass / molar mass
25 g / 74.55 g,p;
0.335 moles
So rearrange the formula to find volume. Vol = moles / Conc
0.335 moles / 0.750 mol / L = 0.447 L or 447 mL

The answer in this question is 447 mL.

5 0

3 years ago

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Automobile catalytic converters use a platinum catalyst to reduce air pollution by changing emissions such as carbon monoxide, C

julia-pushkina [17]

Answer: 448 g of $O_2$ will be required to completely react with 784g moles of CO(g) during this reaction.

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} CO=\frac{784g}{28g/mol}=28moles$

The balanced chemical equation is:

$2CO(g)+O_2(g)\rightarrow 2CO_2(g)$

According to stoichiometry :

2 moles of $CO$ require = 1 mole of $O_2$

Thus 28 moles of $CO$ will require= $\frac{1}{2}\times 28=14moles$ of $O_2$

Mass of $O_2=moles\times {\text {Molar mass}}=14moles\times 32g/mol=448g$

Thus 448g of $O_2$ will be required to completely react with 784g moles of CO(g) during this reaction.

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3 years ago

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What is the direction of heat flow that occurs between the dry ice and the air in the flask

Elan Coil [88]

Without an external doing work, heat will always flow from a hotter to cooler object. Two objects of different tempatures always interact. There are three different ways for heat to flow from one object to another. They are conduction, convention, and radiation.

8 0

3 years ago

Why would it be important to use a homogeneous mixture instead of a heterogeneous mixture for a

Sergio039 [100]

The correct answer is B. A homogeneous mixture has the same properties for every part of the mixture, so the quality of the material is consistent.

Explanation:

In a homogenous mixture, all the components are equally integrated; this means the final result in the case of a material is a material that looks uniform and also has the same properties in every part of section. This homogeneity and consistency are especially important if you are testing the properties of the material or using it for a specific application because if you use a homogenous mixture the quality and properties will be consistent and thus you can obtain consistent results.

6 0

3 years ago

The pH of 0.10 M solution of an acid is 6. What is the acid dissociation constant of the acid?

svlad2 [7]

Answer: Dissociation constant of the acid is $10^{-11}$ .

Explanation: Assuming the acid to be monoprotic, the reaction follows:

$HA\rightleftharpoons H^++A^-$

pH of the solution = 6

and we know that

$pH=-log([H^+])$

$[H^+]=antilog(-pH)$

$[H^+]=antilog(-6)=10^{-6}M$

As HA ionizes into its ions in 1 : 1 ratio, hence

$[H^+]=[A^-]=10^{-6}M$

As the reaction proceeds, the concentration of acid decreases as it ionizes into its ions, hence the decreases concentration of acid at equilibrium will be:

$[HA]=[HA]-[H^+]$