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karsenbeau
02.12.2020 •
Chemistry
which of the following is an example of an electromagnetic wave A. an ocean wave B. A sound wave C. A light wave D. A wave traveling along a rope
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Ответ:
Light waves
Explanation:
It isn't sound because it isn't infrared, involve electromagneticism, or light/radiation. An ocean wave is a literal wave of water, and a wave traveling along a rope is way off course. Choose a light wave. Also, brainliest would be nice. Glad to help
Ответ:
The mass percentage of nitrogen in the sample is 6.04 %
Explanation:
To calculate the number of moles for given molarity, we use the equation:
Molarity of HCl solution = 0.150 M
Volume of solution = 65.0 mL = 0.065 L (Conversion factor: 1 L = 1000 mL)
Putting values in above equation, we get:
The chemical equation for the reaction of HCl and ammonia follows:
By Stoichiometry of the reaction:
1 mole of HCl reacts with 1 mole of ammonia
So,
of HCl will react with =
of ammonia
1 mole of ammonia contains 1 mole of nitrogen and 3 moles of hydrogen element
Moles of nitrogen in ammonia =![9.75\times 10^{-3}mol](/tpl/images/0508/0252/7cd06.png)
To calculate the mass for given number of moles, we use the equation:Moles of nitrogen =![9.75\times 10^{-3}mol](/tpl/images/0508/0252/7cd06.png)
Molar mass of nitrogen = 14 g/mol
Putting values in above equation, we get:
![9.75\times 10^{-3}mol=\frac{\text{Mass of nitrogen}}{14g/mol}\\\\\text{Mass of nitrogen}=(9.75\times 10^{-3}mol\times 14g/mol)=0.136g](/tpl/images/0508/0252/7d8df.png)
To calculate the mass percentage of nitrogen in the sample, we use the equation:Mass of sample= 2.25 g
Mass of nitrogen = 0.136 g
Putting values in above equation, we get:
Hence, the mass percentage of nitrogen in the sample is 6.04 %