Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

In a reaction 48 grams of total reactants form 20 grams of solid product and a gas. What is the mass of the gas?

Answer and explanation

Correct answer: 28 grams

The direct answer is B: 28 grams. The law of conservation of mass says that, in a chemical reaction, the total mass of reactants equals the total mass of products, when the gas is included. Here, total reactant mass is 48 grams. The solid product has a mass of 20 grams, and the remaining mass must belong to the gas. Calculation: mass of gas = total product mass − solid product mass = 48 − 20 = 28 grams. Option A, 20 grams, repeats the mass of the solid and ignores the remaining material. Option B is correct because it balances the total mass. Option C, 48 grams, is the total mass of all products together, not the gas alone. Option D, 68 grams, adds masses instead of finding the missing part and violates conservation of mass. The important exam step is to include invisible or escaping gas in the products. A gas has mass even if it cannot be seen. Remember: missing product mass equals total reactant mass minus known product mass.

Related tags

Chemistry Laws CombinationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.