CHEMISTRY MIDDLE SCHOOL

A rigid canister holds 50.0 L of helium gas at 32.0°C and 49.9 kPa. The gas is cooled until the pressure reaches 14.2 kPa. What is the Kelvin temperature of the helium?

Answers

Answer 1

Answer:

Answer:-

86.794 K

Explanation:-

Initial temperature T 1 = 32 C + 273 = 305 K

Initial Pressure P 1 = 49.9 KPa

New Pressure P 2 = 14.2 KPa

The Volume remains same since it is rigid.

∴V 1 = V 2 = 50.0 L

Using the relation

P 1 V 1 / T1 = P 2 V 2 / T 2

New temperature T 2 = P 2 V 2 T 1 / ( P 1 V 1)

= 14.2 KPa x 50.0 L x 305 K / ( 49.9 KPa x 50.0 L)

= 86.794 K

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Answers

Answer:

0.8149

Explanation:

How does the modern periodic table arrange elements?A.
by atomic mass

B.
by atomic number

C.
by number of isotopes

D.
by electron mass

Answers

Answer:

B. By atomic number.

Explanation:

The atom is the most basic unit of matter with properties of a chemical element. The atom is the fundamental component of all matter. All atoms are made up of a central nucleus in which there are positively charged particles, the protons, around which other negatively charged particles, the electrons, move. The nucleus of the atom also has neutrons, which have a neutral charge.

The atomic number, which is represented by the letter Z, indicates the number of protons that are present in the nucleus of an atom. Determine the identity of an atom and its properties.

The atomic number is used to classify the elements within the periodic table of the elements.

By increasing atomic number

Which of the following best describes how attractive forces of the molecules in a solid compared to a liquid?A)The attractive forces are the same in a solid and liquid
B) The attractive forces are stronger in a liquid
C) The attractive forces are stronger in a solid
D)The attractive forces of a solid allow the particle to move freely while the liquid molecules vibrate around a fixed point

Answers

Answer:

Option-C (The attractive forces are stronger in a solid)

Explanation:

The substance either exist as a Solid or Liquid depends upon on the following two factors;

ii) Kinetic Energy:

Greater the K.E of particles, greater will be the distance between the particles of a substance. In Liquids the K.E of particles is greater than the K.E of particles in Solid. Hence, the Liquid Particles separated by greater distance as compared to particles of Solids.

ii) Attractive Intermolecular Forces:

Greater the Attractive Intermolecular Forces between the particles of a substance, smaller will be the distance between the particles. As the distance between the particles in Solid state of substance are very small as compared to that of Liquids hence, it can be concluded that the Attractive Intermolecular Forces in Solids are stronger than Liquids.

Consider the reaction below. 2Al2O3 4Al + 3O2 How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed? 17.7 mol19.9 mol39.8 mol53.0 mol

Answers

2 Al2O3 = 4 Al + 3 O2

2 moles Al2O3 ------------ 3 moles O2
26.5 moles ----------------- moles O2

moles O2 = 26.5 * 3 / 2

moles O2 = 79.5 / 2 => 39.8 moles O2

Answer : C . ) 39.8 Is The Correct Answer

Which state of matter has a defined volume but undefined shapeliquids
gasses
solids and liquids
liquids and gasses