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3 years ago

What is the molarity of 40ml of NaOH if it takes 25ml of 0.5 molar HCl to neutralize it?

Chemistry

1 answer:

Oksanka [162]3 years ago

6 0

Answer:

Molarity of 40 ml of NaoH is 0.3125 mL

Explanation:

As we know

Molarity of acid * volume of acid = molarity of base * volume of base

Substituting the given values, we get

$0.5 * 25 = X* 40 \\X = \frac{0.5*25}{40} \\X = 0.3125$

Molarity of 40 ml of NaoH is 0.3125 mL

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Imagine a planet that has a similar atmospheric pressure to Earth (760 mmHg) but different concentrations of gases in its atmosp

RUDIKE [14]

Answer:

76 mmHg is the partial pressure of oxygen on this new planet.

Explanation:

Atmospheric pressure on air on earth = 760 mmHg

On an unknown planet :

Oxygen makes up 10% of the atmosphere.

The mole fraction of oxygen gas can be written as = $\chi_1=\frac{10}{100}=0.1$

Carbon dioxide makes up 15% of the atmosphere.

The mole fraction of carbon dioxide gas can be written as = $\chi_2=\frac{15}{100}=0.15$

Nitrogen makes up the remaining 75% of the atmosphere.

The mole fraction of nitrogen gas can be written as = $\chi_1=\frac{75}{100}=0.75$

Atmospheric pressure of air on unknown planet,p= 760 mmHg (given)

Partial pressure of gases can be calculated by the help o Dalton's law of partial pressure:

Partial pressure of oxygen gas :

$p_1=p\times \chi_1$

$p_1=760 mmHg\times 0.1=76 mmHg$

Partial pressure of carbon dioxide gas :

$p_2=p\times \chi_2$

$p_2=760 mmHg\times 0.15=114 mmHg$

Partial pressure of nitrogen gas :

$p_3=p\times \chi_3$

$p_3=760 mmHg\times 0.75=570 mmHg$

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3 years ago

1What is one major difference between fossil fuels and biofuels?

Margarita [4]

The correct answer is A

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3 years ago

Which choice is not a property of an acid?

Lelu [443]

Answer:

it's going to be D

Explanation:

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3 years ago

To 225 mL of a 0. 80 M solution of Kl, a student adds enough water to make 1. 0 L of a more dilute Kl solution. What is the mola

Lady_Fox [76]

Answer: 0.18 M

Explanation:

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4 years ago