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Phoenix [80]
2 years ago
15

The half-life of radon-222 is 3.8 days. How many grams of radon-222 remain

Chemistry
1 answer:
Ne4ueva [31]2 years ago
3 0
I think it’s B but not 100% sure
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What is the percent composition of hydrogen in vinegar (CH3COOH)?​
barxatty [35]

Answer:

                      %H  = 6.72 %

Explanation:

                   Percent composition of an element is the total mass of that element divided by the molecular mass of compound (or molecular mass) of which it is present in.

So,

Percent composition of Hydrogen will be given as,

         %H  =  Total mass of H / Molecular Mass of Acetic Acid × 100

So,

Total Mass of H  =  1.01 × 4 = 4.04 g

Molecular Mass of Acetic acid  =  60.052 g/mol

Putting values in above formula,

         %H  =  4.04 g/mol ÷ 60.052 g/mol × 100

         %H  = 6.72 %

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3 years ago
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Explanation:

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What do you call a mass of rock and soil deposited directly by <br> a glacier
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It's called a "Till"
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The reaction is extremely exothermic, producing a bright yellow light and a great deal of heat energy.

6 0
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An infrared wave has a wavelength of 0.00005 m. What is this wavelength in
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Answer:

B. 5 \times  {10}^{ - 5}\: m

Explanation:

0.00005  \: m= 5 \times  {10}^{ - 5} \: m  \\

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