What is the molarity of the 25% NaOH solution?
Correct answer: B. 6.25
- A. 5.0
- B. 6.25
- C. 3.125
- D. 2.5
Explanation
Molarity (M)= weight of solute in g / litre ÷ Gram Molecular Weight.Molecular weight of NaOH = (23+16+1) = 4025% NaOH 40gm of NaOH in 100ml Solution.Density of water = 1g/ccVolume = 100ml(25/40) ÷ (100/1000)(25 x 1000)/40 x 100= 25/4= 6.25 M
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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