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Gemiola [76]
3 years ago
14

Mr. Forester and Mr. Chavarin were cooking burgers at the Senior Picnic (this was pre-pandemic) and the propane grill ran out of

fuel. When they went to change tanks they noticed that the "empty" tank was covered in ice, which seemed unusual for a sunny June day in Oceanside. Sure enough, the outside temperature was 25 degrees Celsius, while they tank was at -5. If the empty tank still had 0.75 mol of propane once it reached equilibrium (gauge reading 0 kPa) with the air (the barometer said 101.27 kPa that day) and the initial reading for the pressure gauge on the fuel cylinder was [400 + the last three digits of your ID] kPa, how many moles of propane had they burned so far?
I don't know what this is asking me to do so if somebody can help me that'd be great.
Chemistry
1 answer:
Varvara68 [4.7K]3 years ago
3 0

Answer:

140

Explanation:

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Atomic radius increases as you move down a group of elements.
raketka [301]
Yes, the atomic radius increases as you move down a group of elements.  this is true
going down leads to valence electrons that are further away from nucleus -> less electrostatic attraction -> less pull towards nuc. -> greater radius/volume taken
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3 years ago
A scientist prepared an aqueous solution of a 0.45 M weak acid. The pH of the solution was 2.72. What is the percentage ionizati
aleksandr82 [10.1K]

Answer:

0.42%

Explanation:

<em>∵ pH = - log[H⁺].</em>

2.72 = - log[H⁺]

∴ [H⁺] = 1.905 x 10⁻³.

<em>∵ [H⁺] = √Ka.C</em>

∴ [H⁺]² = Ka.C

∴ ka = [H⁺]²/C = (1.905 x 10⁻³)²/(0.45) = 8.068 x 10⁻⁶.

<em>∵ Ka = α²C.</em>

Where, α is the degree of dissociation.

<em>∴ α = √(Ka/C) </em>= √(8.065 x 10⁻⁶/0.45) = <em>4.234 x 10⁻³.</em>

<em>∴ percentage ionization of the acid = α x 100</em> = (4.233 x 10⁻³)(100) = <em>0.4233% ≅ 0.42%.</em>

4 0
3 years ago
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Draw the Lewis structure for the polyatomic formate anion. Be sure to include all resonance structures that satisfy the octet ru
givi [52]

Answer:

Lewis structure of polyatomic formate anion.

Explanation:

To draw Lewis structure for any chemical species,

1)Count the total number of valence electrons present in it.

This can be obtained by adding valence electrons of each constituent atom.

2)Arrange those valence electrons in such a way that each atom should attain eight electrons around it to satisfy octet theory.

The structure of formate ion and its Lewis structure are shown below:

HCOO- is the formate ion.

It has total:

1+4+6+6+1 = 18 valence electrons.

Since, hydrogen has one, carbon has four and oxygen has six valence electrons and the charge of the anion is one.

Arrange this 18 electrons in such a way that each atom should get 8 electrons around it.

Resonance structures of formate ion:

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3 years ago
What is the product of the unbalanced equation below?
kvasek [131]

Answer:

I think B

Explanation:

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Food couldn’t reach the stomach without the esophagus and the _? please help only correct answers.
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<span>Food couldn’t reach the stomach without the esophagus and the throat.</span>
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