PLEASE HELP ME WITH CHEMISTRY

Anastaziya [24]

It changes with the temperature

5 0

3 years ago

A 1.0-l buffer solution initially contains 0.30 mol of nh3 and 0.30 mol of nh4cl what mass of the correct reagent should you add

WARRIOR [948]

To find the mass of reagent to be added in the reaction, we need to determine the pH of the buffer. Using the following equation

pH= pKa + log ([NH3] / [NH4+])
= 9.26 + LOG ( 0.3 / 0.3)
= 9.26

[h+]= 5.5x10^-10 M, you need to increase that concentration for a ph of 8.6, [H+] needs to be 2.51x10^-9M

2.51x10^-9 moles - 5.5x10^10 moles = 1.96x10^-9 moles

1.96x10^-9 x 36.45g/mole = 7.14x10^-8 g

So the mass of HCI that you should add to the reaction is 7.14x10^-8 g

3 0

3 years ago

ANSWER CORRECTLY FOR BRAINLEIST! :)

ankoles [38]

Answer:

cannot see tye question

Explanation:

5 0

3 years ago

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Boron trifluoride gas is collected at in an evacuated flask with a measured volume of . When all the gas has been collected, the

Vaselesa [24]

Answer:

0.683 mol

46.3 g

Explanation:

There is some info missing. I think this is the original question.

<em>Boron trifluoride gas is collected at 21.0 °C in an evacuated flask with a measured volume of 50.0 L. When all the gas has been collected, the pressure in the flask is measured to be 0.330 atm. Calculate the mass and number of moles of boron trifluoride gas that were collected. Round your answer to 3 significant digits.</em>

<em />

Step 1: Convert the temperature to the Kelvin scale

We will use the following expression.

K = °C + 273.15

K = 21.0°C + 273.15

K = 294.2 K

Step 2: Calculate the moles of boron trifluoride gas

We will use the ideal gas equation.

$P \times V = n \times R \times T\\n = \frac{P \times V}{R \times T} = \frac{0.330atm \times 50.0L}{\frac{0.0821atm.L}{mol.K} \times 294.2K} = 0.683 mol$

Step 3: Calculate the mass of boron trifluoride gas

The molar mass of BF₃ is 67.81 g/mol.

$0.683 mol \times \frac{67.81g}{mol} = 46.3 g$

8 0

3 years ago

A carbon atom has a strong tendency to do which of the following?. Answer. double bond with electrons. receive electrons. donate

Novay_Z [31]

Answer: Option (d) is the correct answer.

Explanation:

Atomic number of carbon is 6 and its electronic distribution is 2, 4. Therefore, in order to become stable and completely fill its octet carbon readily share its valence electrons with another atom.

For example, $C + 2H_{2} \rightarrow CH_{4}$

A carbon atom is also able to form a double double with valence electrons of other atom.

Thus, we can conclude that a carbon atom has a strong tendency to share electrons.

5 0

3 years ago

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