Answer :
4.01 x 1012 grammes of beryllium contain 4.45 x 1011 moles of beryllium. The chemical element beryllium has the atomic number 4 and the letter Be assigned to it. Alkaline earth metal is brittle, steel-gray, strong, and light.
The formula: can be used to determine how many moles of a material there are.
Molar mass divided by mass equals a mole.
Beryllium has a molar mass of 9.012 g/mol.
Therefore, we can perform the following calculation to determine how many moles of beryllium there are in 4.01 x 1012 grammes of beryllium:
4.01 x 10-12 grammes are equal to 9.012 grammes per mole.
4.45 x 1011 moles are one mole.
Therefore, 4.01 x 1012 grammes of eryllium contain 4.45 x 1011 moles of eryllium.
Note that both numbers must have the same exponent when writing in scientific notation, and that you must use a calculator to perform the calculation if you don't want to receive the wrong answer.
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