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3 years ago

Adding energy has no effect on the rate of evaporation? True or False ?

Chemistry

1 answer:

zlopas [31]3 years ago

5 0

Answer:

False

Explanation:

Evaporation occurs when molecules in a liquid gain enough energy that they overcome attractions from other molecules and break away to become a gas. Adding energy increases the rate of evaporation.

Hope this helped!

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A fuel gas containing 86% methane, 8% ethane, and 6% propane by volume flows to a furnace at a rate of 1450 m3/h at 15°C and 150

Svetach [21]

Answer:

Basis: Hour

From the question, we will have the following reactions;

CH4 + 2O2 -------- CO2 + 2H20 (Methane with O2)

C2H6 + 3.5O2 -------- 2CO2 + 2H2O (Butane with O2)

C3H8 + 5O2 ---------- 2CO2 + 4H2O (Propane with O2)

But we are also given this,

R=8.314J/mol.K, V=1450m3/h, P=150kPa gauge, Pt=150+101kPa=251kPa, T=15C= 288K

Assuming they are all ideal gases, we can find the no of moles of the gases.

n=PV/RT,

n = 251x103 x 1450 /8.314 x 288

n = 151, 999mols = 152kmols

However from the input and complete reactions stoichiometries above, we will have,

1. Methane 86% = 0.86 x 152kmols = 130kmols, required O2 = 2 x 130.7 = 261.44kmols

2. Ethane 8% = 0.08 x 152kmols = 12.2kmols, required O2 = 3.5 x 12.2 = 42.56kmols

3. Propane 6% = 0.06 x 152 kmols = 9.2kmols, required O2 = 5 x 9.1 = 45.5kmols

O2 = 349.5kmols, with 8% excess, Total O2 = 349.5+ (0.08x349.5) = 377.46kmols

But Air:O2 = 21%: 100%

inflow Air = 377.46x 100/21= 1797.5kmols, at standard pressure and temperature.

From PV =nRT

V (M3/H) = nRT/P

===== 1797.5mol x 8.314Nm/mol.K x 273K/101325Nm-2 x 1000

Hence, the required flow rate of air in SCMH = 40,265m³/h

3 0

3 years ago

The laser in a 3D printer uses light with a frequency of 3.844 × 1014 Hz. Calculate the wavelength of this light in nm. Show all

Natali5045456 [20]

Answer:

The wavelength of this light is 780.4 nm.

Explanation:

Given that,

The frequency of laser light, $f=3.844 \times 10^{14}\ Hz$

We need to find the wavelength of this light.

We know that,

$c=f\lambda$

Where

$\lambda$ is the wavelength of light

So,

$\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3.844 \times 10^{14}}\\\\=7.804\times 10^{-7}\ m\\\\=780.4\ nm$

So, the wavelength of this light is 780.4 nm.

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3 years ago

Balancing equations<br> I'll give brainliest.

wel

Answer:

You should follow these steps:

Count each type of atom in reactants and products.

Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances.

Repeat steps 1 and 2 until the equation is balanced.

Explanation:

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3 years ago

Need help please ASAP

Mashutka [201]

Newton's first law of motion predicts the behavior of objects where all existing forces are balanced. Objects at equilibrium will not accelerate. Also, an object will only accelerate if there is a net or unbalanced force acting upon it. The presence of an unbalanced force will accelerate an object - changing its speed, its direction, or both its speed and direction.

Newton's second law of motion: behavior of objects for and all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

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3 years ago

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