Chemistry 0620
Mole calculator
Every calculation shows the formula, the substitution and the units — laid out the way an examiner wants to see it, not just an answer.
Constants used
- Avogadro constant = 6.02 × 10²³ /mol
- Molar gas volume at r.t.p. = 24 dm³/mol
- 1 dm³ = 1000 cm³
Working
Mass ↔ moles
- Formulan = m / Mr
- MrMr(CaCO3) = 100
- Substituten = 25 / 100
- Answern = 0.25 mol
Final answer
0.25mol