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Chemistry

1 answer:

anzhelika [568]4 years ago

4 0

Answer:

height above sea level---->altitude

continent/ocean-----> geography

latitude---->temperature

moisture available --->rainfall

in ocean-->currents

Explanation: no

Hope this helps!

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How many Atoms are in 12 NaBr

frozen [14]

Answer:

there are 12 atoms in 12 sodium bromide

7 0

3 years ago

What percentage of the mass of hydrofluoric acid (HF) is contributed by hydrogen?

Morgarella [4.7K]

This problem is asking for the percent by mass of hydrogen in hydrofluoric acid. At the end, the answer turns out to be D. 5% as shown below:

<h3>Percent compositions:</h3>

In chemistry, percent compositions are used for us to know the relative amount of a specific element in a compound. In order to do so for hydrogen, we use the following formula, which can also be applied to any other element in a given compound:

$\% H=\frac{m_H*1}{M_{HF}}*100\%$

Where $m_H$ stands for the atomic mass of hydrogen and $M_{HF}$ for the molar mass of hydrofluoric acid. In such a way, we plug in the atomic masses of hydrogen (1.01 g/mol) and fluorine (19.0 g/mol) to obtain: