Question

2. The mass of one atom of an unknown element is 4 * 1.66 x 10 ^-24g, The element is:
1) Hydrogen
2) Helium
3) Oxygen
4) Sulphur

Answer 1

Sulphur. Not sure
Hydrogen and oxygen are completely wrong

Answer 2

Answer:

The correct answer is 2) Helium

Explanation:

amu or atomic mass unit is a unit that is used to measure the mass of a single atom.

It's value is 1.66×10^-24 g.

So basically you can determine the answer of dividing The molar mass of element by Avogadro Number.

When you can see any question of this type just divide it by amu. You can see the atomic mass of the desired element.

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