Question
What will be the concentration of nitric acid in mole
per litre in a sample which has density 1.41 gm L⁻¹ and the mass percent of nitric acid if being 69%?Solution
1. Mass of 1L solution = 1410g 2. Mass of HNO₃ = 1410 × 0.69 = 972.9g 3. Moles of HNO₃ = 972.9/63 = 15.44 4. Molarity = 15.44 mol/L
The income of Surya is Rs. 75,000. He spent 16(2/3)% of his income on food, 60% of the remaining income on rent and saved 44% of the income remaining a...
In a triangle ABC, AB = AC. The length of the median from A to BC is 9 cm and the angle between the median and AB is 60°. Find the length of AB.
HCF and LCM of two numbers are 13 and 455. If one number lies between 60 and 70, then the other number lies between
(32) -3/5 = ?
? = 49.99² ÷ (1.98⁵ + 8.01 × 89.91) + 75.15% of (263.89 × 49.11)
The sum of the ages of a father and his son is 50 years. After 5 years, the father's age will be twice that of his son. What are their present ages?
A regular hexagon has a side length of 6 units. What is the area of the hexagon?
Let a plane pass through the point (1, –1, 2) and is perpendicular to the vector 2i + j − 2k. Then its Cartesian equation is:
Solve: 2(x+3) = 8(x–1)
