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3 years ago

1. How many isotopes does hydrogen have?

Chemistry

2 answers:

Illusion [34]3 years ago

7 0

Answer:

Hydrogen has three isotopes.

Explanation:

I hope this helps!

natima [27]3 years ago

6 0

Answer:

There are 3 isotopes of the element hydrogen.

Explanation:

hydrogen, deuterium, and tritium.

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3 years ago

An 100g box have a temperature of 22 C. What temperature must a 200g box be kept at in order for both to have the same amount of

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3 years ago

What data can be used to make a model of food?

drek231 [11]

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Explanation:

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3 years ago

In the equation C3H8 + O2 -> CO2 + H2O, what coefficient belongs in front of the O2 group?

tankabanditka [31]

Answer:

Explanation:

C3H8. + 5O2. ::: 3CO2. + 4H2O

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3 years ago

A particular oral contraceptive contains 0.038 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. H

Ray Of Light [21]

<u>Answer:</u> The number of molecules of ethinyl estradiol present in one pill are $7.71\times 10^{16}$

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of ethinyl estradiol = 0.038 mg = $3.8\times 10^-5}g$ (Conversion factor: 1 g = 1000 mg)

Molar mass of ethinyl estradiol $(C_{20}H_{24}O_2)=[(20\times 12)+(24\times 1)+(2\times 16)]=296g/mol$

Putting values in above equation, we get:

$\text{Moles of ethinyl estradiol}=\frac{3.8\times 10^{-5}g}{296g/mol}=1.28\times 10^{-7}mol$

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of molecules

So, $1.28\times 10^{-7}mol$ of ethinyl estradiol will contain = $(1.28\times 10^{-7}\times 6.022\times 10^{23})=7.71\times 10^{16}$ number of molecules

Hence, the number of molecules of ethinyl estradiol present in one pill are $7.71\times 10^{16}$

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3 years ago