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
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When you have to write about what you do in your spare time, you need to write about your hobbies.
Hobbies are activities that you do in your spare time just because you like them and not because you are obligated to do them.
For instance, these are some examples of sentences about what I do in my spare time:
- Juego al tenis en mi tiempo libre.
- Me gusta escuchar música en mi tiempo libre.
- Cuando tengo tiempo libre, me junto con mis amigos.
It's important to decide what you want to write about and once you write them, check if they are grammatically correct.
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The relative frequency of 9/17 is 53%. 53% of the students prefer waffles.
Answer:
first what is the question
In recent years, the United States has been known to export more of its services abroad than it has imported due to its experienced workforce and industrialization.
<h3>
What is Export?</h3>
These are the goods and services which are sold to another country in exchange of money and its equivalents and is regarded as one of the determinants of the value of the gross domestic product of countries.
High technological advancement which led to the increase in industries etc in the United States has led to an increase in goods production which are sufficient enough to cater for the people. This is the why the excess is usually sold to other countries. The more exports a country has, the more revenue it generates to cater for other departments.
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