A reaction at evolves of boron trifluoride gas. Calculate the volume of boron trifluoride gas that is collected. You can assume the pressure in the room is exactly . Round your answer to significant digits.

3.10 L

Explanation:

A reaction at 11.0°C evolves 133.mmol of boron trifluoride gas. Calculate the volume of boron trifluoride gas that is collected. You can assume the pressure in the room is exactly 1 atm. Round your answer to 3 significant digits.

Step 1: Convert the temperature to the Kelvin scale

When working with gases, we must use the absolute temperature scale. We can convert the temperature from Celsius t Kelvin using the following expression.

K = °C + 273.15

K = 11.0°C + 273.15

K = 284.2 K

Step 2: Convert the amount of matter to moles

We will use the conversion factor 1 mol = 1000 mmol.

133 mmol × (1 mol/1000 mmol) = 0.133 mol

Step 3: Calculate the volume of boron trifluoride gas

We will use the ideal gas equation.

P × V = n × R × T

V = n × R × T / P

V = 0.133 mol × (0.0821 atm.L/mol.K) × 284.2 K / 1 atm

V = 3.10 L

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j