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2 years ago

Select the correct choice there's only one answer.

Chemistry

2 answers:

KATRIN_1 [288]2 years ago

6 0

Answer:

<h2>Option C is the correct option.</h2>

The Valence electrons in S

Explanation:

Sulphur has highest effective nuclear charge as in a period there is increase in effective nuclear charge from left to right.Sulphur is in the end in a period leaving Mg and Al in left side.

Hope this helps....

Good luck on your assignment...

stepladder [879]2 years ago

5 0

The correct answer is opinion c

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Use the ideal gas law to calculate the concentrations of nitrogen and oxygen present in air at a pressure of 1.0 atm and a tempe

notka56 [123]

Answer:

[N₂] = 0.032 M

[O₂] = 0.0086 M

Explanation:

Ideal Gas Law → P . V = n . R . T

We assume that the mixture of air occupies a volume of 1 L

78% N₂ → Mole fraction of N₂ = 0.78

21% O₂ → Mole fraction of O₂ = 0.21

1% another gases → Mole fraction of another gases = 0.01

In a mixture, the total pressure of the system refers to total moles of the mixture

1 atm . 1L = n . 0.082L.atm/mol.K . 298K

n = 1 L.atm / 0.082L.atm/mol.K . 298K → 0.0409 moles

We apply the mole fraction to determine the moles

N₂ moles / Total moles = 0.78 → 0.78 . 0.0409 mol = 0.032 moles N₂

O₂ moles / Total moles = 0.21 → 0.21 . 0.0409 mol = 0.0086 moles O₂

4 0

3 years ago

A city's water supply is contaminated with a toxin at a concentration of 0.63 mg/L. For the water to be safe for drinking, the c

Shalnov [3]

Answer:

Approximately 22.37 days, will it take for the water to be safe to drink.

Explanation:

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

k is rate constant

Given that:- k = 0.27 (day)⁻¹

$[A_0]$ = 0.63 mg/L

$[A_t]=1.5\times 10^{-3}$ mg/L

Applying in the above equation as:-

$1.5\times 10^{-3}=0.63e^{-0.27\times t}$

$63e^{-0.27t}=150\times \:10^{-3}$

$e^{-0.27t}=\frac{1}{420}$

$t=\frac{100\ln \left(420\right)}{27}=22.37$

Approximately 22.37 days, will it take for the water to be safe to drink.

7 0

3 years ago

I NEED HELP ASAP !

Lana71 [14]

Answer:

643.21g 1 mol 6.022^23

262.87 g 1 mol

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4.061x10^24 1mol 22.4 (L)

6.022^23 1mol

= 151 liters H2O2

479.3g 1 mol 6.022^23

18.02g 1mol

= 1.60E25 H20 atoms

80.34L 1mol 164.1

22.4L 1mol

588.6g Ca(NO3)2

893.7g 1mol 22.4

44.01g 1mol

= 427 L CO2 or 427.4

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6.022^23 1mol

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8 0

2 years ago

n the diagram shown, when an object ‘X’ is brought near the ring shaped magnet, the magnet moves away from it. Four friends are

kati45 [8]

Answer:

Akash

Explanation:

it could be a magnet with the same poles facing eachoher

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2 years ago

Which substance is composed of atoms that all have the same atomic number

Ierofanga [76]

Answer:

dont just go off of me because im not sure but i think its c

Explanation:

6 0

2 years ago