3 years ago

Coal _____.

Chemistry

2 answers:

lyudmila [28]3 years ago

8 0

Produces almost half is the answer.

butalik [34]3 years ago

6 0

Produces almost half of out nation's electricity

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Question 8 Saved Which of the following energy transformations occurs when you eat a hamburger? Question 8 options: The chemical

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The first one is the answer.

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A molecule contains five atoms and has a molecular weight of 85 g per mole. the atoms are of elements with atomic numbers 1, 6,

inessss [21]

Answer:

Dichloromethane

Explanation:

As we know the atomic number given belongs to following elements, i.e.

Atomic # Element M.Mass

1 Hydrogen 1 g.mol⁻¹

6 Carbon 12 g.mol⁻¹

17 Chlorine 35.5 g.mol⁻¹

Also the molecular formula of Dichloromethane is,

= CH₂Cl₂

Putting molar masses of each element,

= (12)₁ + (1)₂ + (35.5)₂

= 12 + 2 + 71

= 85 g.mol⁺¹

Result:

Hence the only possible structure containing 5 atoms is Dichloromethane.

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3 years ago

Write a paragraph to explain the answer to the following prompt:

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A solution prepared by dissolving 0.100 mole of propionic acid in enough water to make 1.00 L of solution is observed to have a

torisob [31]

Answer:

C) $k_a=1.3\times 10^{-5}$

Explanation:

pH is defined as the negative logarithm of the concentration of hydrogen ions.

Thus,

pH = - log [H⁺]

The expression of the pH of the calculation of weak acid is:-

$pH=-log(\sqrt{k_a\times C})$

Where, C is the concentration = 0.5 M

Given, pH = 2.94

Moles = 0.100 moles

Volume = 1.00 L

So, $Molarity=\frac{Moles}{Volume}=\frac{0.100}{1.00}\ M=0.100\ M$

C = 0.100 M

$2.94=-log(\sqrt{k_a\times 0.100})$

$\log _{10}\left(\sqrt{k_a0.1}\right)=-2.94$

$\sqrt{0.1}\sqrt{k_a}=\frac{1}{10^{2.94}}$

$k_a=1.3\times 10^{-5}$

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3 years ago