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Novosadov [1.4K]
2 years ago
9

How many atoms are there in a sample of lead with a mass of 6.8 g?

Chemistry
1 answer:
Leviafan [203]2 years ago
3 0

Answer:

B

Explanation:

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What volume of a 0.155 M potassium hydroxide solution is required to neutralize 25.7 mL of a 0.388 M hydrobromic acid solution
vekshin1

Answer: Therefore, the volume of a 0.155 M potassium hydroxide solution  is 56.0 ml

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

According to the neutralization law,

n_1M_1V_1=n_2M_2V_2

where,

M_1 = molarity of HBr solution = 0.338 M

V_1 = volume of HBr solution = 25.7 ml

M_2 = molarity of KOH solution = 0.155 M

V_2 = volume of KOH solution = ?

n_1 = valency of HBr = 1

n_2 = valency of KOH = 1

1\times 0.338\times 25.7=1\times 0.155\times V_2

V_2=56.0ml

Therefore, the volume of a 0.155 M potassium hydroxide solution  is 56.0 ml

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3 years ago
An acid is used to bring the pH of a solution from pH 9 to pH 6. How many times more acidic is the final solution than the initi
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The final solution is 1.5 times more acidic than the initial solution

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