Which phrase best defines the term energy

A 1.0 mole sample of fluorine gas at 25 °C has an average molecular velocity of 415 m/s. What is the total KE of the gas sample?

Mariana [72]

The total kinetic energy of the gas sample is 3.3 KJ

<h3>What is kinetic energy? </h3>

This is the energy possessed by an object in motion. Mathematically, it can be expressed as:

KE = ½mv²

Where

KE is the kinetic energy
m is the mass
v is the velocity

<h3>How to determine the mass of the fluorine gas</h3>

Molar mass of fluorine gas = 38 g/mol
Mole of fluorine gas = 1 mole
Mass of fluorine gas = ?

Mass = mole × molar mass

Mass of fluorine gas = 1 × 38

Mass of fluorine gas = 38 g

<h3>How to determine the KE of the gas sample</h3>

Mass (m) = 38 g = 38 / 1000 = 0.038 Kg
Velocity (v) = 415 m/s
Kinetic energy (KE) =?

KE = ½mv²

KE = ½ × 0.038 × 415²

KE = 3272.275 J

Divide by 1000 to express in kilojoule

KE = 3272.275 / 1000

KE = 3.3 KJ

Learn more about energy:

brainly.com/question/10703928

#SPJ1

4 0

2 years ago

When potassium cyanide (KCN) reacts with acids, a deadly poisonous gas, hydrogen cyanide (HCN), is given off: KCN(aq) + HCl(aq)

maks197457 [2]

<u>Answer:</u> The mass of hydrogen cyanide formed is 0.17 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of KCN = 0.420 g

Molar mass of KCN = 65.12 g/mol

Putting values in equation 1, we get:

$\text{Moles of KCN}=\frac{0.420g}{65.12g/mol}=0.0064mol$

The given chemical equation follows:

$KCN(aq.)+HCl(aq.)\rightarrow HCN(g)+KCl(aq.)$

As, hydrochloric acid is present in excess. So, it is considered as an excess reagent.

Thus, potassium cyanide is a limiting reagent because it limits the formation of products.

By Stoichiometry of the reaction:

1 mole of potassium cyanide produces 1 mole of hydrogen cyanide.

So, 0.0064 moles of potassium cyanide will produce = $\frac{1}{1}\times 0.00064=0.0064mol$ of hydrogen cyanide

Now, calculating the mass of hydrogen cyanide from equation 1, we get:

Molar mass of HCN = 27.02 g/mol

Moles of HCN = 0.0064 moles

Putting values in equation 1, we get:

$0.0064mol=\frac{\text{Mass of HCN}}{27.02g/mol}\\\\\text{Mass of HCN}=0.17g$

Hence, the mass of hydrogen cyanide formed is 0.17 grams

3 0

4 years ago

Balance the chemical equation by adding coefficients as needed. equation:

Rom4ik [11]

Balance the chemical equation by adding coefficients as needed. equation:

4HCl + -1As2O3 + 4NaNo3 + -5H2O → 12No + -2H3AsO4 + 4NaCl

Chemical Equation

A chemical equation is a symbolic representation of a chemical reaction in the form of symbols and formulae, where the reactant entities are given on the left and the product entities are given on the right, with a plus sign separating the entities in both the reactants and the products and an arrow pointing in the direction of the products to indicate the reaction's direction. The absolute values of the stoichiometric numbers are shown as coefficients next to the symbols and formulas of the entities. Jean Beguin drew the first chemical equation in 1615.

To learn more about the chemical equation refer here:

brainly.com/question/22817140

#SPJ4

7 0

1 year ago

What variables do you need to calculate speed?

swat32

The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time. In this example, distance is in metres (m) and time is in seconds (s), so the units will be in metres per second (m/s).

7 0

3 years ago

Read 2 more answers

2 Cuso, +4 KI → 2 Cul +2 K,SO, + 12 9.

krok68 [10]

Is there a picture you have that we can see?

4 0

3 years ago

Which phrase best defines the term energy​

Which phrase best defines the term energy