Question

4. Find the number of hydrogen atoms required to obtain 1.0 kg
hydrogen atom to be 1.0 u. Given : 1.0 u = 1.66 x 10
kg.
-27
5
24​

Answer 1

Answer:

Grade 12. Since we know the grams, 1kg or 1000g, we simply divide by the molar mass (1.0079g/mole) to get 992.2 moles of hydrogen. We then multiply by Avagadro's number, 6.0221415x10^23. This gives us 5.975x10^26 atoms in a 1kg sample of hydrogen.