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3 years ago

According to Bohr's model of the atom, electrons can be found

Chemistry

1 answer:

MAVERICK [17]3 years ago

4 0

D . on orbits or energy levels around the nucleus

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what is the molarity of a solution that contains 1.25 moles of K2SO4 dissolved into water to make 1.5 liters of solution?

Elena L [17]

Answer: 0.8 M

Explanation:

molarity = (moles of solute)/(liters of solution) = 1.25/1.5 = 0.8 M

7 0

3 years ago

What happens when an unstable nucleus undergoes radioactive decay?

Vlad1618 [11]

I believe the answer is C. an unstable nucleus emits radiation and is transformed into the nucleus of one or more elements. i hope this helps!

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3 years ago

Part a the disproportionation of mn2+(aq) to mn(s) and mno2(s) in acid solution at 25 ∘c. calculate δg∘rxn.

ollegr [7]

Answer:

Δ $G^{o}$ = -461198.3 J

Explanation:

Gibbs free energy is defined as the energy associated with a given chemical reaction which can be used to do work. Firstly, we need to figure out the chemical equation for the given problem. For the given problem, the chemical equation is:

$Mn^{2+} _{(aq)} + 2e^{-}$ ⇒ $Mn_{(s)}$ $E^{o} = -1.18 V$

$Mn^{2+} _{(aq)} + H_{2}O$ ⇒ $MnO_{2(s)} +4H^{+} + 2e^{-}$ $E^{o} = -1.21 V$

The addition of the two $E^{o}$ gives the $E_{cell}$ of the equation, i.e. -1.18-1.21 = -2.39 V.

Then, using the equation for Δ $G^{o}$ , we have:

Δ $G^{o}$ = n*F* $E^{o}$ = 2*96485*-2.39 = -461198.3 J

4 0

4 years ago

Consider the calculation of the pressure in kilopascals exerted by 1.25 g of nitrogen gas in a flask of volume 250 mL (0.250 dm3

Harrizon [31]

The amount of the nitrogen gas, N₂ molecules present is 2.68×10²² molecules

<h3>Avogadro's hypothesis </h3>

1 mole of N₂ = 6.02×10²³ molecules

<h3>How to determine the mole of N₂</h3>

We'll begin by calculating the number of mole of N₂. This can be obtained as follow:

Mass of N₂ = 1.25 g
Molar mass of N₂ = 28.02 g/mol
Mole of N₂ =?

Mole = mass / molar mass

Mole of N₂ = 1.25 / 28.02

Mole of N₂ = 0.0446 mole

<h3>How to determine the molecules of N₂ present</h3>

From Avogadro's hypothesis,

1 mole of N₂ = 6.02×10²³ molecules

Therefore,

0.0446 mole N₂ = 0.0446 × 6.02×10²³

0.0446 mole N₂ = 2.68×10²² molecules

Thus, the molecules of N₂ present is 2.68×10²² molecules

Learn more about Avogadro's number:

brainly.com/question/26141731

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2 years ago

Dough to which potassium bromate has been added rises better, producing a lighter, larger volume loaf.

Maslowich

2KBrO₃(s) = 2KBr(s) + 3O₂(g)
Oxygen gas is formed.
This food supplement E924 is banned in some countries.

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3 years ago