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chubhunter [2.5K]
3 years ago
9

A sample of Xe takes 75 seconds to effuse out of a container. An unknown gas takes 60 seconds to effuse out of the identical con

tainer under identical conditions.
What is the most likely identity of the unknown gas?
What is the most likely identity of the unknown gas?
Br2
O2
Kr
He
Chemistry
2 answers:
miss Akunina [59]3 years ago
8 0

Answer:

Kr

Explanation:

Now we have to apply Graham's law of diffusion in gases

t1/t2 = √M1/M2

If t1 is the time of diffusion of Xe = 75 seconds

t2 is the time of diffusion of the unknown gas = 60 seconds

M1= molar mass of Xe=131.293

M2= molar mass of the unknown gas

Thus;

75/60 = √131.293/M2

(75/60)^2= (√131.293/M2)^2

5625/3600=131.293/M2

M2= 3600×131.293/5625

M2= 84.0

The unknown gas is krypton (Kr)

garri49 [273]3 years ago
7 0

Answer:

The unknown gas has an atomic mass of 84.0 g/mol. This is krypton (Kr)

Explanation:

Step 1: Data given

It takes 75 seconds for Xe to effuse

Atomic mass of xenon = 131.29 g/mol

An unkknown gas (X) takes 60 seconds to effuse

Step 2: Calculate the atomic mass of the unknown gas

Time of Xe / time X = √(atomic mass Xe/ atomic gas X)

75/60 = √(131.29 / X)

1.25 = √(131.29 / X)

1.5625 = (131.29 / X)

X = 131.29 / 1.5625

X = 84.0 g/mol

The unknown gas has an atomic mass of 84.0 g/mol. This is krypton (Kr)

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Compound Y has the elements C, H, N and O. It's exact mass is 91.0425. Answer the following questions. Isotope Exact Mass 1H 1.0
Talja [164]

Answer:

Six C atoms (C₆); five H atoms (H₅); one N atom (N); no O atoms

Explanation:

The rule of 13 states that the formula of a compound is a multiple n of 13 (the molar mass of CH) plus a remainder r.

MF = CₙHₙ₊ᵣ

Y has a molecular mass of 91 u

91/13 =7r0

The formula can't be C₇H₇ because a hydrocarbon must have an even number of H atoms,

The odd mass and the odd number of H atoms make it reasonable to add an N atom and subtract CH₂ (CH₂ = 14):

C₇H₇ + N - CH₂ = C₆H₅N

Check:

6C = 6 × 12.000 = 72.000 u

5H = 5 ×   1.008 =   5.040

1N =  1 × 14.003 =  <u>14.003    </u>

             TOTAL =   91.043 u

This is excellent agreement with the observed mass of 91.0425 u.

There are six  C atoms (C₆)

There are five H atoms (H₅)

There is    one N atom   (N)

There are no   O atoms.

4 0
3 years ago
According to Newton’s second law of motion, when an object is acted on by an unbalanced force, how will that object respond? It
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Answer:

C) It will accelerate.  

Explanation:

According to Newton’s second law of motion, when an object is acted on by an unbalanced force, it will accelerate.

An unbalanced force will change the speed or direction (or both) of an object. A change in speed and/or direction is acceleration.

A) is wrong. The object will stop moving only if there is a balanced force in the opposite direction.

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Answer:

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Kryger [21]

The empirical formula : C₁₂H₄F₇

The molecular formula : C₂₄H₈F₁₄

<h3>Further explanation</h3>

mol C (MW=12 g/mol)

\tt \dfrac{18.24}{12}=1.52

mol H(MW=1 g/mol) :

\tt \dfrac{0.51}{1}=0.51

mol F(MW=19 g/mol)

\tt \dfrac{16.91}{19}=0.89

mol ratio of C : H : O =1.52 : 0.51 : 0.89=3 : 1 : 1.75=12 : 4 : 7

Empirical formula : C₁₂H₄F₇

(Empirical formula)n=molecular formula

( C₁₂H₄F₇)n=562 g/mol

(12.12+4.1+7.19)n=562

(281)n=562⇒ n =2

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