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3 years ago

HELPPP ASAP PLEASE .

Chemistry

1 answer:

Viktor [21]3 years ago

5 0

Answer:

ok .

Explanation:

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A compound that is composed of only carbon and hydrogen contains 80.0% c and 20.0% h by mass. What is the empirical formula of t

gladu [14]

<u>Solution</u> : Emperical Formula = $CH_{3}$

Emperical Formula - A formula that gives the simplest whole number ratio of atom in a compound.

In the question percentages are given then assume that the total mass is 100grams so that the mass of each element is equal to the percentage given.

Given : 80.0g Carbon

20.0g Hydrogen

First convert the given masses into moles.

$80.0g\text{ C} \times \frac{1 g/mole \text{ C}}{12.0 g/mole \text{ C}}= 6.66\text{mole of C}$

$20.0g\text{ H} \times \frac{1 g/mole \text{ H}}{1 g/mole \text{ H}}= 20.0\text{mole of H}$

Value of each mole divided by the smallest number of moles and then round off.

Moles ratio of the element are

$\frac{6.66}{6.66}\text{mole of C}= 1$

$\frac{20.0}{6.66}\text{mole of C}= 3$

This is the mole ratio of the elements and is repersented by the subscript in the emperical formula.

Emperical Formula = $CH_{3}$

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Ultraviolet radiation and radiation of shorter wavelengths can damage biological molecules because they carry enough energy to b

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Answer:

The longest wavelength of radiation with enough energy to break a carbon–carbon bond is 343.75 nm.

Explanation:

E = hc/λ

E: energy = 348 000 J / 6.022 x 10²³ = 5.7788 x 10⁻¹⁹ J

h: Planck's constant = 6.62607004 × 10⁻³⁴ J.s

c: speed of light = 299 792 458 m / s

λ: wavelength

λ = hc/E

λ = (6.62607004 × 10⁻³⁴ J.s x 299 792 458 m / s) / 5.7788 x 10⁻¹⁹J

λ = 3.4375 x 10⁻⁷ m

λ = 343.75 nm

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