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malfutka [58]
3 years ago
12

The element hydrogen is made up of which kind(s) of atoms?

Chemistry
2 answers:
kompoz [17]3 years ago
6 0

Answer:

<em>B. only hydrogen atoms</em>

Explanation:

A compound can contain atoms of several elements.

for example the H_2O contains two hydrogen atoms and one atom of oxygen.

An element can only have atoms of itself for example O_2 has two atoms of the same element

The hydrogen element can only be formed by hydrogen atoms.

sergey [27]3 years ago
3 0
B. only hydrogen atoms
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Answer:

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Explanation:

The given compounds have been arranged  from left to right in order of increasing percentage by mass of hydrogen.

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Calculate the concentration in mol/L, M, of an aqueous sugar solution with a concentration of 23.5% (w/w) and density of 1.005 g
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Answer:

The concentration in mol/L is 0.683M

Explanation:

23.5% (w/w)

This data means that in 100 g of solution, we have 23.5 grams of solute.

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Moles = Mass / Molar mass

Moles = 23.5 g /342.30 g/m

Moles = 0.068 moles

Density data make us know, the volume of our solution.

solution δ = solution mass / solution volume

δ = 1.005 g/mL = 100 g /  solution volume

solution volume = 100g / 1.005 g/ml

solution volume = 99.5 mL

In conclusion, 0.068 moles are in 99.5 mL

Molarity (M) is mol/L

Let's convert 99.5 mL in L

99.5 mL / 1000 = 0.0995 L

0.068 m / 0.0995L = 0.683

<em>If we convert moles in mmoles, we can also get Molarity (M)</em>

<em>mmoles / mL = M</em>

<em>0.068 moles . 1000 = 68 mmoles</em>

<em>68 mmmoles / 99.5mL = 0.683</em>

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