18 flashcards · Shared on 19 August 2026 by AtomAI Library
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What is one mole of a substance?
The amount containing 6.02 × 10^23 specified particles
What is one mole of a substance?
The amount containing 6.02 × 10^23 specified particles
Which equation relates amount in moles, mass and molar mass?
n = m ÷ M
How many moles are present in 14.6 g of sodium chloride, NaCl, with a molar mass of 58.5 g mol⁻¹?
0.250 mol
Which expression gives concentration in mol dm⁻³?
Concentration = moles ÷ volume in dm³
What conversion is needed before using a volume measured in cm³ in a molar concentration calculation?
Divide the volume by 1000 to obtain dm³
A solution contains 0.50 mol of solute in 250 cm³. What is its concentration?
2.0 mol dm⁻³
How many moles of solute are present in 150 cm³ of a 0.200 mol dm⁻³ solution?
0.0300 mol
How is mass concentration in g dm⁻³ related to molar concentration?
Mass concentration = molar concentration × molar mass
A sulfuric acid solution contains 9.8 g dm⁻³ of H₂SO₄. Given that its molar mass is 98 g mol⁻¹, what is its molar concentration?
0.100 mol dm⁻³
In a titration calculation, what gives the reacting mole ratio?
The coefficients in the balanced chemical equation
Hydrochloric acid reacts with sodium hydroxide in a 1:1 mole ratio. If 25.0 cm³ of 0.100 mol dm⁻³ HCl reacts with 20.0 cm³ of NaOH, what is the NaOH concentration?
0.125 mol dm⁻³
Sulfuric acid reacts according to H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. What concentration of NaOH is needed if 20.0 cm³ neutralizes 25.0 cm³ of 0.100 mol dm⁻³ H₂SO₄?
0.250 mol dm⁻³
Calcium carbonate reacts according to CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O. How many moles of HCl react completely with 0.010 mol of CaCO₃?
0.020 mol
Which equation can be used when a solution is diluted without changing the number of moles of solute?
c₁V₁ = c₂V₂
A 50.0 cm³ sample of 2.00 mol dm⁻³ solution is diluted to a total volume of 250 cm³. What is the new concentration?
0.400 mol dm⁻³
What is the equivalence point of a titration?
The point at which the reactants have been mixed in the exact stoichiometric ratio
What is the endpoint of an acid–base titration?
The observed point at which the indicator changes colour
Three titres are 24.60 cm³, 24.65 cm³ and 25.40 cm³. Which mean titre should be used, treating the third result as an outlier?
24.63 cm³