Question

А sample of argon, Ar contains 5.97 moles
OF argon
atoms. How many grams of
argon are present ? (The average atomic mass
argon is 39.95 gram per mole

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Answer 1

Answer:

39.94g/mol

Explanation:

Isotopelsotopic molar mass Abundance

36Ar 35.96755g/mol-1 0.3337%

38Ar 37.96272g/mol-1 0.063%

40Ar 39.9624g/mol-1 99.600%

Average atomic mass

sum of the product masses and natural abundance/100

Average atomic mass of argon

35.96755(0.337)+37.96272(0.063)+39.9624(99.600)÷100

= 39.94g/mol