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3 years ago

What is the only thing in nature that can be a solid a liquid or a gas?

Chemistry

1 answer:

Marysya12 [62]3 years ago

4 0

Water is the only thing in nature that can be solid, liquid, or a gas.

Ice, water, and vapors

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A gas has a temperature of 14 °C, and a volume of 4.5 liters. If the temperature is raised to 29

Ierofanga [76]

The new volume of the gas wii be 4.7 liters.

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3 years ago

476 nm = [? ]10 cm give your answer in scientific notation.

KatRina [158]

1nm=10^-6 cm.

476 nm = 4.76E-5 cm

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3 years ago

What are the two rules for deciding the number of significant digits in the answer to a calculation?

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(1) For multiplication and division, you determine the number of significant digits in each number in your problem. The significant digits of your answer is determined by the number with fewer digits. (2) For addition and subtraction, you determine the place value of each number in your problem. The significant digits of the answer is determined by the number that is least precise.

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3 years ago

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Answer & Explanation:

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4 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]

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

Explanation:

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