All categories

3 years ago

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is the molar mass of the unknown compound?

1 answer:

5 0

Using the Ideal Gas Law
PV= nRT
PV = (m/Mr) RT The molar mass of the unknown compound is : 38.0 g/mol

Mr = mRT / PV = 0.465 g x 0.08206 L * atm * K⁻¹ mol ⁻¹ x 298 K / 1.22 atm x 0.245 L = 38.0 g / mol

everything else but G / Mol are cancelled out.

You might be interested in

Give three reasons why fluid spills in water are more damaging than fluid spills on land

marta [7]

Answer:

1) Oil is less dense than water so when oil spills, it spreads across the entire water surface.

2) The oil spreads very quickly with lighter oils such as gasoline.

3) Wind, Currents, and Warm Temperatures will cause Oil to spread quicker.

7 0

2 years ago

The allotropic form of a non – metal is a good conductor of electricity. Name the nonmetal.

SashulF [63]

Answer:

carbon with graphite as the allotrope

8 0

2 years ago

Iodine would have chemical properties most like?

mrs_skeptik [129]

manganese (Mn)
.tellurium (Te)
.chlorine (Cl).
xenon (Xe).

6 0

3 years ago

Answer the 4 questions pls

Vedmedyk [2.9K]

A b A or just the person above me said

7 0

3 years ago

Read 2 more answers

The potential energy diagram shows the gain and loss of potential energy as water molecules decompose into hydrogen and oxygen.

Dovator [93]

Answer:

The diagram with the five labels of the parts is in the image attached. Please, see the image.

Explanation:

1) General explanation: a potential chemical energy diagram is used to show how the reactants gain energy until they reach the activation energy, form the activated complex, and release part of the energy to form the products.

The difference between the chemical potential energy of the products and the reactants is the enthalpy of the reaction:

ΔH rxn = ΔH products - ΔH reactants.

The labels that correspond to each part of the diagram are explained next.

2) Reactants:

This is the substances at the start, so they appear on the left bottom side of the diagram.

3) Activation energy:

It is the energy that the reactants must reach (the highest point) in order to the reaction occurs.

4) Activated complex:

This is the intermediate state and of highest energy. The reactants have formed a complex at mid way between the reactants and the products.

5) Products:

These are the substances formed when the reaction is completed. They are lower in energy than the activated complex. They can be either higher or lower in energy than the reactants. The products are shown to the right of the diagram.

6) Enthalpy of the reaction:

The enthalpy of the reaction is the difference in energy of the products and the reactants. In this case, since, the products are higher in energy, it means that the reaction absorbed energy and it is an endothermic reaction.

4 0

3 years ago