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
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Fundamental Concepts of Chemistry
894 free Fundamental Concepts of Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Fundamental Concepts of Chemistry questions
Calculate mass of sodium which contains same number of atoms as are present in 4g of calcium (Atomic weight Na = 23, atomic weight Ca = 40)
The number of moles of NO2 which contains 16 g of Oxygen:
The vapor pressure of water at room temperature is 23.8 mm Hg. The vapour pressure of an aqueous solution of sucrose with mole fraction 0.2 is equal to:
Mass of 1 molecule of O2 is:
The number of moles of CO2 which contain 8.0 g of oxygen are:
Identify the correct option with the same empirical formula for both compounds: