What mass of sodium hydroxide (GFM 40) is in 0.25 mol?
Answer and explanation
Correct answer: C. 10 g
- Step 1: Mass = moles × GFM.
- Step 2: 0.25 × 40 = 10 g.
Answer
10 g.
Why not the others: 160 g: the moles were divided into the GFM. 0.00625 g: the moles were divided by 40. 40 g: this is the mass of 1 mol.
Practise more Chemical Changes and Structure.
Free questions with an explanation for every one, and full timed National 5 (Scotland) mock tests.
More Chemical Changes and Structure questions
- An atom of sodium has atomic number 11 and mass number 23. How many protons, neutrons and electrons does it have?
- What are isotopes?
- What is the electron arrangement of a chlorine atom (atomic number 17)?
- The Group 1 metals become more reactive going down the group. What is the main reason?
- Sodium chloride does not conduct electricity when solid but conducts when molten. What is the reason?
- Which statement describes covalent bonding?