Chapter 25.8, Problem 2.3ACP

### Chemistry & Chemical Reactivity

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

Chapter
Section

### Chemistry & Chemical Reactivity

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

# What amount of NaTcO4 is there in 1.0 μg of the salt? What mass of Tc?

Interpretation Introduction

Interpretation:

The amount of NaTcO4in1.0μg of salt and the mass of Tc in it has to be determined.

Concept introduction:

•                   Numberofmole=GivenmassofthesubstanceMolarmass
• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
• Massofthesubstance=Amountofthesubstance×Molarmass
Explanation

Using the following equation amount of NaTcO4 can be calculated,

Â Â Â Â AmountÂ ofÂ NaTcO4â€‰=Givenâ€‰â€‰massâ€‰â€‰ofâ€‰NaTcO4â€‰â€‰Molarâ€‰â€‰massâ€‰â€‰ofâ€‰â€‰NaTcO4

Given mass of salt is 1.0â€‰Î¼â€‰gâ€‰â€‰=â€‰â€‰1.0â€‰Ã—â€‰106â€‰â€‰g

Molar mass of NaTcO4 is 184.9â€‰g/mol

AmountÂ ofâ€‰NaTcO4â€‰=â€‰â€‰1.0â€‰Ã—â€‰106â€‰g184

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