Chemistry Stoichiometry DUHS 2022
PMDC Verified Question 56 of 105
Ratio of atomic mass of hydrogen to atomic mass of C is:
A
One fourth
B
One twelfth
C
Half
D
Double
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: One twelfth
Concept:

Atomic masses are relative values. By comparing the standard atomic masses of two elements from the periodic table, we can establish a fixed mass ratio between them.

Formula:

$$ \text{Ratio} = \frac{\text{Mass of H}}{\text{Mass of C}} $$

Solution:

  • The standard atomic mass of Hydrogen (H) is approximately 1 amu.


  • The standard atomic mass of Carbon (C) is exactly 12 amu.


  • The ratio of Hydrogen to Carbon is \( 1 : 12 \).


  • This mathematically equates to one-twelfth (\( 1/12 \)).


Why other options are incorrect:

  • One fourth, Half, Double: These represent incorrect fractional relationships (1:4, 1:2, 2:1) that completely ignore the actual atomic masses on the periodic table.

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