(i) Total mixture is 500 g. Sugar concentration is 15 percent, flour is 84 percent and sodium hydrogencarbonate is 1 percent by mass. (ii) Copper is 84 g and zinc is 36 g.
Solve the following problems: (i) A cake recipe uses dry ingredients, namely 75 g of sugar for 420 g of all-purpose flour and 5 g of sodium hydrogencarbonate. Express the concentration of each component in the mixture using an appropriate method. (ii) A brass alloy contains 70% copper by mass. Calculate the quantities of copper and zinc present in 120 g of brass.
Share
(i) Total mass is 75 + 420 + 5 = 500 g. Sugar concentration is 75/500 × 100 = 15 percent, flour is 420/500 × 100 = 84 percent and sodium hydrogencarbonate is 5/500 × 100 = 1 percent. (ii) Copper = 70/100 × 120 = 84 g. Zinc = 120 − 84 = 36 g.
For more NCERT Solutions of Class 9 Science Exploration Chapter 5 Exploring Mixtures and their Separation Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-5/