X and Y are two elements which form and . If mole of weighs and mole of weighs , the atomic weights of X and Y are respectively:

Question

X and Y are two elements which form  and . If  mole of  weighs  and  mole of  weighs , the atomic weights of X and Y are respectively:

Canvas Classes · Accepted Answer

Strategy:
 We can determine the molar mass of each compound from the given mass and moles (). By setting up two simultaneous linear equations based on the molecular formulas, we can solve for the individual atomic weights of X and Y.

Step 1: Find molar masses of the compounds
- For : 
- For :

Step 2: Set up and solve linear equations
Let atomic weights be  and :
1) 
2)

Multiply (1) by 3 and (2) by 2:

Subtracting gives .
Substituting  into (1): .

More questions from Some Basic Concepts of Chemistry (Mole Concept)