Concept explainers
Interpretation: The mystery metal needs to be identified, if 20.0 g of mystery metal contains 4 times as many atoms as there are in 20.0 g of silver metals.
Concept Introduction: The molecular mass of compound is the sum of
Answer to Problem 3STP
Correct answer: Option (D)
Explanation of Solution
Reason for correct option:
Mass of silver metal = 20.0 g
Molar mass of silver = 108 g/mol
Mass of mystery metal = 20.0 g
Number of atoms of mystery metal = 4 x number of atoms of silver
Thus moles of mystery metal = 4 x moles of silver
Calculate moles of silver-
Calculate moles of mystery metal:
Calculate molar mass of mystery metal:
The metal with molar mass 27.0 g/mol is Aluminium.
Reasons for incorrect options: Since the molar mass of iron is 55.8g/mol, platinum is 195 g/mol and lithium is 6.94 g/mol therefore they are not mystery metal.
Chapter 6 Solutions
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