mMCQ.

Navigation Menu

Step into mMCQ.

Launch mMCQ. diagnostic

Explore mMCQ.

MDCAT prepFree DiagnosticPricing & SubscribeSign in

Resources

Terms & Conditions

mMCQ.

© 2021 - 2025 mMCQ.All rights reserved.

WhatsApp
  1. Home
  2. MDCAT
  3. Chemistry
  4. Introduction to Fundamental Concepts of Chemistry
MDCAT
Chemistry
2017

Chemistry · Introduction to Fundamental Concepts of Chemistry

Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.

Question

Calculate the grams of H2O formed when 8g of CH4 burns in excess of oxygen:

Options
  • A

    21 grams

  • B

    19 grams

  • C

    18 grams

  • D

    15 grams

Explanation

8/16 = 0.5 mol of CH4 

1 mole of CH4 yields 2 moles of H2O, so 0.5 mole will yield 1 mole of H2O. 

Mass = mol x Mr = 18 x 1 = 18g 

Hence, option C is the only right answer. 

As per given calculations, C is the right option.

As per given calculations, C is the right option.  

8/16 = 0.5 mol of CH4 

1 mole of CH4 yields 2 moles of H2O, so 0.5 mole will yield 1 mole of H2O. 

Mass = mol x Mr = 18 x 1 = 18g 

Hence, option C is the only right answer. 

As per given calculations, C is the right option.

Keep practising Chemistry

Take the free 2 minutes diagnostic to map weak topics, then unlock full Biology, Chemistry, Physics, English, and Logical Reasoning practice for PKR 15,000/month.

Start free diagnosticExplore MDCAT

Tagged under Chemistry · Introduction to Fundamental Concepts of Chemistry · 2017