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2 years ago

8

A sample of nitrogen gas is in a 65.0-L automobile air bag and has a pressure of 745 mm Hg. What is the pressure of this sample

of gas at the same temperature if it is placed into a 25.0-L bag

1 answer:

inysia [295]2 years ago

5 0

Answer:

the pressure = 1937mmhg using standered unit of volume

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What is the pOH of a 0.150 M solution of potassium nitrite? (Ka HNO2 = 4.5 x 10−4 )

yanalaym [24]

Answer:

11.9 is the pOH of a 0.150 M solution of potassium nitrite.

Explanation:

Solution : Given,

Concentration (c) = 0.150 M

Acid dissociation constant = $k_a=4.5\times 10^{-4}$

The equilibrium reaction for dissociation of $HNO_2$ (weak acid) is,

$HNO_2+H_2O\rightleftharpoons NO_2^-+H_3O^+$

initially conc. c 0 0

At eqm. $c(1-\alpha)$ $c\alpha$ $c\alpha$

First we have to calculate the concentration of value of dissociation constant $(\alpha )$ .

Formula used :

$k_a=\frac{(c\alpha)(c\alpha)}{c(1-\alpha)}$

Now put all the given values in this formula ,we get the value of dissociation constant $(\alpha )$ .

$4.5\times 10^{-4}=\frac{(0.150\alpha)(0.150\alpha)}{0.150(1-\alpha)}$

$4.5\times 10^{-4} - 4.5\times 10^{-4}\alpha =0.150\alpha ^2$

$0.150\alpha ^2+4.5\times 10^{-4}\alpha-4.5\times 10^{-4}=0$

By solving the terms, we get

$\alpha=0.0533$

No we have to calculate the concentration of hydronium ion or hydrogen ion.

$[H^+]=c\alpha=0.150\times 0.0533=0.007995 M$

Now we have to calculate the pH.

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

$pH=-\log (0.007995 M)$

$pH=2.097\approx 2.1$

pH + pOH = 14

pOH =14 -2.1 = 11.9

Therefore, the pOH of the solution is 11.9

4 0

3 years ago

In which of the following is the symbol for the ion and the number of electrons it contains given correctly?

tensa zangetsu [6.8K]

The answer is A. .....

4 0

3 years ago

What coefficient must be added to the carbon in the reactants to balance the following equation?

Sophie [7]

Answer:

2

Explanation:

There are 3 carbons on the right side

there are only two on the left side....you need one more ...so add one more... change the '1' coefficient in front of C to '2'

7 0

2 years ago

The structure of a comet is considered to be like a large, ____, or a mass of frozen ice and rock. a. solid planet c. cratered m

svetlana [45]

B is the correct answer I hope that this help

6 0

2 years ago

Find the molar mass of AI(NO3)3?<br><br> Explain plz!

NeX [460]

Answer:

212.996 or 213 approx.

hope it helps.

Molar mass of Al - 27

Molar mass of N - 14

Molar mass of O - 16

so, the molar mass of (No3)3 will be (14+16×3)3 which is equals to 186.

so, Molar mass of Al(No3)3 will be 186+27 = 213.

8 0

2 years ago

Read 2 more answers