5.21 - Calculations using moles and the Avogadro constant Flashcards
1
Q
What is a mole?
A
The amount of a substance that contains the same number of particles as the number of carbon atoms in exactly 12g of Carbon-12
2
Q
What is Avogadro’s constant?
A
6.02x10^23
3
Q
What does Avogadro’s constant represent?
A
The number of atoms/particles in 1 mole of any substance
4
Q
How would you calculate the amount of NaCl in a 6.51g sample?
A
- Divide the mass by relative formula mass
- 6.51g/58.5 = 0.111 moles
5
Q
How would you calculate the mass of 0.263 moles of hydrogen iodide?
A
- Multiply the number of moles by the relative formula mass
- 0.263 * 127.9 = 33.6g
