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3 years ago

•What do you think salt water is useful for?

Chemistry

1 answer:

Ivanshal [37]3 years ago

6 0

Answer:

it is good for thermoelectric power plant cooling

it means that there is a lot of salt in the water

Someone would remove salt from water to be able to drink it

lastly, salt can be removed from water with reverse osmosis systems

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Aspirin (acetylsalicylic acid, C9H8O4) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolv

Blababa [14]

Answer:

The value of the dissociation constant will be: $3.94\times 10^{-4}$ .

Explanation:

$AsH\rightleftharpoons As^++H^+$

At ,t= 0 c 0 0

At eq'm (c-x) x x

Concentration of aspirin = c

$c=\frac{2.00 g}{180 g/mol\times 0.600 L}=0.01851 M$

Expression for dissociation constant will be given as:

$K_a=\frac{[H^+][As^+]}{[AsH]}=\frac{x\times c}{(c-x)}=\frac{x^2}{(c-x)}$ ..(1)

The pH of the solution = 2.60

The pH of the solution is due to free hydrogen ions whcih come into solution after partial dissociation of aspirin.

$pH=2.60=\log[H^+]=-\log[x]$

$x=0.002511 M$

Putting value of x in (1).

$K_a=\frac{x^2}{(c-x)}=\frac{(0.002511 M)^2}{(0.01851 M-0.002511 M)}$

$K_a=3.94\times 10^{-4}$

The value of the dissociation constant will be: $3.94\times 10^{-4}$ .

6 0

4 years ago

What happens when you add solids to a container of liquids with various densities?

hram777 [196]

Answer:

They pile on top of each other

Explanation:

Since the liquids all have different densities, they won't be able to mix

8 0

4 years ago

A mixture of nitrogen and hydrogen gases, at a total pressure of 663 mm Hg, contains 3.46 grams of nitrogen and 0.156 grams of h

STALIN [3.7K]

Answer: The partial pressure of nitrogen gas is 405.76 mmHg and that of hydrogen gas is 257.24 mmHg

Explanation:

To calculate the number of moles, we use the equation:

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

For nitrogen gas:

Given mass of nitrogen gas = 3.46 g

Molar mass of nitrogen gas = 28 g/mol

Putting values in above equation, we get:

$\text{Moles of nitrogen gas}=\frac{3.46g}{28g/mol}=0.123mol$

For hydrogen gas:

Given mass of hydrogen gas = 0.156 g

Molar mass of hydrogen gas = 2 g/mol

Putting values in above equation, we get:

$\text{Moles of hydrogen gas}=\frac{0.156g}{2g/mol}=0.078mol$

Mole fraction of a gas is calculated by using the formula:

$\chi_{A}=\frac{n_{A}}{n_{A}+n_{B}}$ ......(1)

For nitrogen gas:

Putting values in equation 1, we get:

$\chi_{\text{nitrogen gas}}=\frac{0.123}{0.123+0.078}=0.612$

For hydrogen gas:

Putting values in equation 1, we get:

$\chi_{\text{hydrogen gas}}=\frac{0.078}{0.123+0.078}=0.388$

The partial pressure of a gas is given by Raoult's law, which is:

$p_A=p_T\times \chi_A$ ......(2)

where,

$p_A$ = partial pressure of substance A

$p_T$ = total pressure = 663 mmHg

$\chi_A$ = mole fraction of substance A

For nitrogen gas:

$p_{\text{Nitrogen gas}}=663mmHg\times 0.612\\\\p_{\text{Nitrogen gas}}=405.76mmHg$

For hydrogen gas:

$p_{\text{Hydrogen gas}}=663mmHg\times 0.388\\\\p_{\text{Hydrogen gas}}=257.24mmHg$

Hence, the partial pressure of nitrogen gas is 405.76 mmHg and that of hydrogen gas is 257.24 mmHg

4 0

3 years ago

What is the pOH of a solution of HNO3 that has [OH– ] = 9.50 × 10–9 M?

Arturiano [62]

The correct answer to that question is
= 8.02

7 0

3 years ago

Read 2 more answers

A sample of gas has an initial volume of 4.2 L at a pressure of 736 mmHg. If the volume of the gas is increased to 9.0 L , what

Lana71 [14]

We will use Boyle's law. P = 1/V which simply means pressure is inversely proportion to volume at a constant temperature. We will assume temperature here does not change. Since we have two pressure/volume points, we use this version of Boyle's law.

P1 V1 = P2 V2

P is pressure and V is volume

In our case:

P1 is 736, V1 is 4.2 while V2 is 9.0 but P2 is unknown. This is what we need to find out.

736 * 4.2 = P2 * 9.0

P2 = 736 * 4.2 / 9.0

P2 = 3091.2 / 9.0

P2 = 343.5

Therefore the new pressure 343 mm/hg

Here we see that the increase in volume causes decrease in pressure in total agreement with Boyle's law.

8 0

3 years ago