The density of copper is a...

The are of a rectangle is 12 in^2. what is the area in cm^2. there are 2.54cm in an inch.

balu736 [363]

Area measured in squares (or square units). We can count the squares or we can take the length and the width multiplication. The rectangle above has an area of 15 square units.

6 0

3 years ago

A sample of nitrogen gas has a temperature of 22.7oC when the volume of the container is 12.2L and it is under 150.4kPa of press

Marrrta [24]

Answer:

The final temperature of the gas would need to be approximately 158.4 K

Explanation:

The details of the sample of nitrogen gas are;

The initial temperature of the nitrogen gas, T₁ = 22.7°C = 295.85 K

The initial volume occupied by the gas, V₁ = 12.2 L

The initial pressure of the gas, P₁ = 150.4 kPa

The final volume of the gas, V₂ = 9.7 L

The final pressure of the gas, P₂ = 101.3 kPa

Let 'T₂', represent the final temperature of the gas, by the ideal gas equation, we have;

$\dfrac{P_1 \times V_1}{T_1} = \dfrac{P_2 \times V_2}{T_2}$

$\therefore \ T_2 = \dfrac{P_2 \times V_2 \times T_1 }{P_1 \times V_1}$

Plugging in the values gives;

$\therefore \ T_2 = \dfrac{101.3 \, kPa \times 9.7 \ L \times 295.85 K}{150.4 \ kPa \times 12.2 \ L} \approx 158.4327959 \ K$

The final temperature of the gas, T₂ ≈ 158.4 K

3 0

3 years ago

A student designs an ammeter (a device that measures electrical current) that is based on the electrolysis of water into hydroge

Aleks04 [339]

Answer:

4.61 x 10ˉ⁴ mole H₂(g)

Explanation:

Given electric current for 2 min. => 12.4ml of wet H₂(g) at 25⁰C & 715Torr => ? moles H₂(g)

PV = nRT => n = PV/RT

• P = P(H₂) + P(H₂O) = 715Torr = 715mm = P(H₂) + 23.8mm

=> P(H₂) = (715 – 23.8)mm = 619.2mm = 619.2mm/760mm/Atm = 0.815Atm

• V = 12.8ml = 0.0128L

• R = 0.08206 L∙Atm/mol∙K

• T = 25⁰C = 298K

Substituting … n = PV/RT

=> n = (0.815Atm)(0.0128L)/(0.08206 L∙Atm/mol∙K)(298K) = 4.61 x 10ˉ⁴ mole H₂(g)

3 0

3 years ago

Which statement gives the main idea of the kinetic theory of heat?

seraphim [82]

Answer:

The best option is "Heat is transferred by the interaction of moving particles."

Explanation:

The Kinetic Molecular Theory of Heat states that molecules in a fluid increase their speed as temperature increases.

Kinetic theory of heat is a theory that the temperature of a body is determined by the average kinetic energy of its particles and that an inflow of heat increases this energy.

Heat and temperature are related to each other, but are different concepts.

1. Heat is the total energy of molecular motion in a substance while temperature is a measure of the average energy of molecular motion in a substance.

2. Temperature does not depend on the size or type of object.

Also heat can be transferred but temperature can't be transferred.

7 0

3 years ago

In what way are the electron configurations of h, li, na, k, rb, and cs similar?

OLga [1]

Answer:

These elements are of s-block and the all have

ns¹ (n = 1 to 7) electronic configuration

8 0

3 years ago