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3 years ago

Please help with that problem Important İ have quiz tomorrow

Chemistry

1 answer:

iogann1982 [59]3 years ago

6 0

Answer:

Final pressure of the gas remaining in the first container is 3.5 atm

Explanation:

Since it is given that temperature is constant , we can apply -

PV=constant , where

P = Pressure of the gas

V = Volume of the container in which the gas is contained

Initially,

For container 1 -

$P_{i}$ = 4 atm

$V_{1}$ = 6 L

Finally,

For container 2 -

$P_{f,2}$ = 3 atm

$V_{2}$ = 1 L

For container 1 -

$P_{f,1}$ = ?

$V_{1}$ = 6 L

∴ $P_{i}$ $V_{1}$ = $P_{f,1}$ $V_{1}$ + $P_{f,2}$ $V_{2}$

∴ 4×6 = ( $P_{f,1}$ ×6) +(3×1)

∴ $P_{f,1}$ = 3.5 atm

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Is the number of electrons in different shells of an atom fixed or unlimited ? Explain by giving an example.

Pepsi [2]

Answer:

the number of electrons in a particular shell is given by the formula 2n^2 . However an electron when gets very exicited loose energy in the forms of radiation and comes in high energy level shell.

8 0

3 years ago

PLEASE ANSWER ASAP ITS TIMED

Andrews [41]

The mole ratio Aluminium to Aluminum Oxide is 2 : 1

<h3>Further explanation</h3>

Given

Reaction

2Al + Fe ----> Al2O3 +2Fe

Required

The mol ratio

Solution

If we look at the reaction above, there is an element missing from the reactant i.e oxygen, because the number of atoms and elements involved in the reaction should be the same between the reactants and products.

So the possible and balanced reactions are:

2Al(s) + Fe₂O₃ (s) → Al₂O₃ (s)+ 2Fe (s)

From this reaction the ratio of Al: Al₂O₃ can be determined, which is 2: 1

3 0

2 years ago

43. We have a radioactive isotope called RI which has a half-life of 12 million years. A geologist

ioda

Answer: Thus 3 half lives have taken place.

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{2.303}{k}\log\frac{100}{50}$

$t_{\frac{1}{2}}=\frac{0.693}{k}$

Number of half lives = $\frac{\text {total time}}{\text {half life}}=\frac{36million}{12million}=3$

Thus 3 half lives have taken place.

8 0

3 years ago

Which theory allows physical scientists to quantify or measure things like energy

Natali5045456 [20]

Answer is: quantum theory (mechanics).
Quantum theory is theory in physics which describes nature of energy levels of atoms and subatomic particles. Quantum theory is formulated in different particularly developed mathematical formalisms.
According to this theory energy of a system may be restricted to discrete values (quantization).

6 0

3 years ago

Carnot Cycle. If a boiler's heat source produces 106 Btu/hr at 600F, what is the highest possible rate at which work may be prod

Alchen [17]

Answer:

W = 141.333 BTu/h

Explanation:

W = Q ( 1 - TL/TH )......carnot

∴ Q = 106 BTu/h

∴ TH = 600 °F

∴ TL = 70 °F

⇒ W = 160 BTu/h ( 1 - 70/600 )

⇒ W = 141.333 BTu/h

5 0

3 years ago