PHYSICS HIGH SCHOOL

Air is made of 80% nitrogen and 20% oxygen by volume. The densities of air and oxygen is 1.29kgm^-3 and 1.43kgm^-3 respectively. What is the density of nitrogen? Please specify your soultion,thank you!

Answers

Answer 1

Answer:

Volume % = mole %

Molar mass of oxygen = 32kg/kmol

Molar mass of nitrogen = 28 kg/kmol

Density of nitrogen = Density of oxygen x molar mass of oxygen x molar ratio of air x molar mass of nitrogen

Density of nitrogen = (1.43kgm^-3)(1 kmol O2/32 kg O2)(80 kmol N2/ 20 kmol O2)(28 kg N2/1 kmol O2) = 5.01 kg/m3

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Answers

We know the formulas for momentum and energy. But they both involve the mass of
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How did some U.S. citizens oppose the Vietnam war?Many left the U.S. for Europe.
Many expressed opposition through protest marches.
Many sent supplies to the South Vietnamese.

Answers

They protested by marching in the streets.

Answer:

Many expressed opposition through protest marches.

is the answerd.

Which type of galaxy has arms that contain sites of active star formation and start close to a bulge in the center?A. elliptical
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Answers

Answer:D:normal spiral

Explanation:

Answer:

Explanation:

A quantity of a gas is an absolute pressure of 400 K PA in the absolute temperature of 110° Kelvin when the temperature of the gas is raised to 235° Kelvin what's the new pressure of the gas?

Answers

Given:

P1 = 400 kPa
T1 = 110 K

T2 = 235K

Required:

Solution:

Apply Gay-Lussac’s law where P/T = constant

P1/T1 = P2/T2

P2 = T2P1/T1

P2 = (235K)(400kPa) / (110K)

P2 = 855 kPa

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Answers

Answer:

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Explanation:

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Answers

Answer:

Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by a combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms.

Explanation:

Answer:

Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms. Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.

Explanation:hope dis helps u

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