Question

7. Radium is a radioactive element that decays into radon gas. Its atomic mass
is 226. How many moles in 500 grams of radium?

Answer 1

Answer:

negative substance can increase

Answer 2

The number of mole in 500 g of radium is 2.212 moles.

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

With the above formula, we can obtain the number of mole of in 500 g of radium.

• Mass = 500 g

• Molar mass = 226 g/mol

• Mole =?

Mole = mass / molar mass

Mole of radium = 500 / 226

Mole of radium = 2.212 moles

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