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Chapter 2, Problem 114GQ
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### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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Section
BuyFindarrow_forward

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# A reagent occasionally used in chemical synthesis is sodium-potassium alloy. (Alloys are mixtures of metals, and Na-K has the interesting property that it is a liquid.) One formulation of the alloy (the one that melts at the lowest temperature) contains 68 atom percent K; that is, out of every 100 atoms, 68 are K and 32 are Na. What is the mass percent of potassium in sodium-potassium alloy?

Interpretation Introduction

Interpretation:

The mass percent of potassium in sodium-potassium alloy has to be determined.

Concept introduction:

• Masspercent=MassofchemicalTotalmassofthecompound×100%
• Massofthesubstance=Amountofthesubstance×Molarmass
Explanation

Here in the given alloy form contains 68â€‰â€‰atomâ€‰â€‰percentâ€‰â€‰K that is, out of every 100 atoms 68â€‹â€‹â€‰â€‰areâ€‰â€‰Kâ€‰â€‰andâ€‰â€‰32â€‰â€‰areâ€‰â€‰Na

From these number of atoms of potassium and sodium mass of each atoms can be calculated, and then mass percent of potassium in the given sodium potassium alloy can be easily determined as follows,

Massâ€‰â€‰ofâ€‰â€‰potassiumâ€‰â€‰=â€‰â€‰68â€‰Ã—39.1â€‰molarâ€‰â€‰massâ€‰â€‰ofâ€‰potassium=â€‰â€‰2658.8â€‰gâ€‰â€‰â€‰KMassâ€‰â€‰ofâ€‰â€‰â€‰sodiumâ€‰â€‰â€‰â€‰â€‰â€‰â€‰=â€‰â€‰32â€‰â€‰Ã—22.98â€‰molarâ€‰â€‰massâ€‰â€‰ofâ€‰sodiumâ€‰â€‰=â€‰â€‰735.7â€‰â€‰gâ€‰â€‰NaTotalâ€‰â€‰massâ€‰â€‰ofâ€‰alloyâ€‰â€‰=â€‰â€‰3394

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