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The amount of grams of hydrogen that are in the water sample is;
3.985 g
<h3>Avogadro's number</h3>
We are given that;
Number of moles of oxygen in a sample of water = 12 × 10²³
- Now, the chemical formula of a molecule of water is H₂O. This means that for every 1 atom or molecule of oxygen, there must be 2 hydrogen atoms or molecules present.
Since Number of moles of oxygen in the sample is 12 × 10²³, then number of moles of hydrogen will be twice that = 2 × 12 × 10²³ = 24 × 10²³ moles
Now, molar mass of hydrogen is 1 g/mol and we know that;
Molar mass = Avogadro's number(6.023 × 10²³) moles
Thus;
6.023 × 10²³ moles = 1 g/mol
Thus; 24 × 10²³ moles of hydrogen = ( 24 × 10²³ × 1)/(6.023 × 10²³)
⇒ 3.985 g
Read more on Avogadro's number at; brainly.com/question/914267
The number of clocks that are not defective is an illustration of proportions
Of the 10000 clocks, 9250 are probably not defective
<h3>How to determine the number of clocks that are not defective?</h3>
From the complete question, we have the following parameter:
15 out of 200 clocks are defective
The above means that the number of clocks that are not defective is:
Not defective = 200 - 15
Not defective = 185
Express as percentage
Not defective = 185/200
Not defective = 92.5%
In 10,000 the number of clocks that are not defective would be:
Not defective = 92.5% * 10000
Not defective = 9250
Hence, 9250 of the 10000 clocks are probably not defective
Read more about proportions at:
brainly.com/question/22521330
If we read the complete exercise, we can understand that the correct answer is 9 students.
This is a math related exercise.
If we take into consideration that Sean is the 5th highest in the class, it means that there are four more people before him.
However, he is also the 5th lowest mark in the class, so it means that there are four more people below him.
If we also count Sean, there are:
Check more information about math exercises here brainly.com/question/10704243?referrer=searchResults
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