What is the mass of #3.8*10^24# atoms of argon?

Answer 1

#3.8xx10^24# argon atoms have a mass of approx. #250*g#.

#6.022xx10^23# argon atoms have a mass of #39.95*g#. How do I know this? Well, #6.022xx10^23# is #"Avogadro's number"#, and the Periodic Table lists the mass of #"Avogadro's number of each atom"#.

And thus we calculate the product:

#(3.8xx10^24" argon atoms")/(6.022xx10^23" argon atoms mol"^-1)xx39.95*g*mol^-1# #=# #??g#

Argon is often used in the laboratory to provide a protective blanket of inert gas for reactions with air and water sensitive reagents. Why should argon be unreactive towards the reagents?

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Mateo Aguilar

Twelve grams is the mass of 3.8*10^24 atoms of argon.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.