3 years ago

A rock from the moon contains 12.5 percent of the potassium-40 it began with. how old is the rock

Chemistry

1 answer:

My name is Ann [436]3 years ago

4 0

1.25 billion years ago,2.5 billion years ago, 3.75 years ago,and 5 billion years ago.

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If a sample of oxygen occupies a volume of 2.15 L at a pressure of 58.0 kPa and a temperature of 25°C, what volume would this sa

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3 years ago

If 12.4 mol of Ne gas occupies 122.8 L, how many mol of Ne would occupy 339.2 L under the same temperature and pressure? Record

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Answer:

3.43×10¹ mol

Explanation:

Given data:

Initial number of moles = 12.4 mol

Initial volume = 122.8 L

Final number of moles = ?

Final volume = 339.2 L

Solution:

The number of moles and volume are directly proportional to each other at same temperature and pressure.

V₁/n₁ = V₂/n₂

122.8 L/ 12.4 mol = 339.2 L / n₂

n₂ = 339.2 L× 12.4 mol / 122.8 L

n₂ = 4206.08 L.mol /122.8 L

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3 years ago

A solution of potassium hydroxide reacts completely with a solution of nitric acid. What solid mixture does it create?

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Answer:

$\boxed{\text{KNO}_{3}}$

Explanation:

The reaction is

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If you evaporate the water, the solid substance is the compound, potassium nitrate.

$\boxed{\textbf{KNO}_{3}}$

KNO₃(aq) ⟶ KNO₃(s)

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