Question

what is the mass in grams of 6.022×10^23 atoms of oxygen

Answer 1

Knowing the mass of each atom allows us to calculate how many atoms are in a given mass. We known that the atomic mass (in amu) of hydrogen is about 1 and the atomic mass of oxygen is 16. So any particular numer of oxygen atoms weighs 16 times as much as the same number of hydrogen atoms.

There is a particular number of atoms, called Avogadro's number, that the weight (in grams) of that collection is numerically equal to the atomic weight (in amu) of a single atom. That number of atoms is called a mole. The number of atoms in a mole is 6.02x 10^23, Avogadro’s number.

So a mole of oxygen atoms (atomic weight=16 amu) weighs 16 grams. So figure out what proportion your number of oxygen atoms is to 6.02 x 10^23, multiply by 16 grams, and there is your answer

Answer 2

As we know that , atomic mass of oxygen=16g

1 mole of oxygen = 6.022*10^23 atoms of oxygen

Also,

1 mole of oxygen = 16g of oxygen

Therefore,

16g of oxygen = 6.022*10^23 atoms of oxygen

So the mass in gram is 16g of 6.022*10^23 atoms of oxygen