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Dmitriy789 [7]
3 years ago
14

From 1962 until 1981 pennies were made from 95% copper and 5% zinc and had a mass of 3.1 g. Starting in 1982, pennies have been

made from 97.5% zinc and 2.5% copper and have a mass of 2.5 g. Suppose you have a sample of pennies that consists of 45.4% pre-1982 pennies. Determine the average mass of a penny in this sample.
Chemistry
1 answer:
Sloan [31]3 years ago
8 0

Answer:

2.7724 g

Explanation:

Mass of pre- 1892 pennies = 3.1 g

Abundance = 45.4 %

Mass of post 1892 pennies = 2.5 g

Abundance = 100 - 45.4 = 54.6 %

The average mass is given as = ( 3.1 g   *  45.4 / 100)  +  (2.5g  *  54.6 / 100)

Average Mass = 3.1 * 0.454   +   2.5  *  0.546

Average Mass = 1.4074  + 1.365 = 2.7724 g

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2 years ago
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It is made of only nonmetals is not true because there are other elements that form it.
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3 years ago
The electron stable state configuration in atoms is best seen in the ______ configuration.
mamaluj [8]
<span>The electron stable state configuration in atoms is best seen in the inert gas configuration.
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By knowing the natural abundance of minor isotopes, it's possible to calculate the relative heights of M+ and M+1 peaks. If natu
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Answer:

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Explanation:

Given the data in the question;

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7 0
2 years ago
SCRIE FORMULA ŞI DENUMEŞTE SUBSTANŢA
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Answer:

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adică

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8 0
3 years ago
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