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2 years ago

Which atom has a mass of 12 u

Chemistry

2 answers:

Flauer [41]2 years ago

8 0

Answer:

carbon-12

Explanation:

One atomic mass unit is approximately the mass of Hydrogen-1, a proton, a neutron, and precisely one-twelfth the mass of Carbon-12, meaning that Carbon-12's atomic mass is 12u.

Andrews [41]2 years ago

4 0

Answer:

Carbon-12

Explanation:

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Answer:

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EZ U-U

Explanation:

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2 years ago

Which of the following contains ionic bonding? (2 points)

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2 years ago

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A sample of pure NO2NO2 is heated to 335 ∘C∘C at which temperature it partially dissociates according to the equation 2NO2(g)⇌2N

Alborosie

Answer:

$k_c =$ 1. 1 × 10⁻²

Explanation:

Given that:

Temperature = 335 ° C = (335+ 273)K = 608

Pressure = 0.750 atm

Volume = 1 Litre

number of moles of NO2 = ???

Rate Constant =0.0821 L atm /K/mol

Using the Ideal gas equation

PV = nRT

n = $\frac{PV}{RT}$

n = $\frac{0.75*1}{0.0821*608}$

n = 0.015

n = 1.5 × 10⁻² mole

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The equation for the reaction can be illustrated as:

2NO2(g) ⇌ 2NO(g) + O2(g)

For the ICE table; we have:

Initial x 0 0

Change -2y + 2y +y

Equilibrium (x - 2y) 2y y

Total moles at equilibrium = (x-2y)+2y+y

= x + y moles

However,

1.5 × 10⁻² mole of the mixture has a mass of 0.525 g

i.e x + y moles = 1.5 × 10⁻² mole

Now, molar mass of 1 mole of NO2 = 46g/mol

Since number of moles = $\frac{mass}{molar mass}$

mass of (x-2y) moles = 46 × (x-2y) g

Molar mass of NO = 30 g/mol

Also, mass of NO = 2y × 30 = 60y

Molar mass of O2 = 32 g/mol

Mass of O2 = y × 32 = 32y

Total mass = ( 46x - 90y)+60y+32y = 0.525

46x = 0.525

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x = 0.0114

x = 1.14 × 10⁻²

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[O2] = 3.6 × 10⁻³ M

$k_c = \frac{[NO]^2[O_2]}{[NO_2]^2}$

$k_c = \frac{(7.2*10^{-3})^2(3.6*10^{-3})}{(4.2*10^-3)^2}$

$k_c =$ 0.011

$k_c =$ 1. 1 × 10⁻²

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2 years ago

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