Ideal gas law: PV = nRT

P-pressure
V-volume
n-number of moles(m/M)
R-constant
T- temperature

State given info:
V=10L
T=298k
P=203kPa
R=8.31(only for kPa, for pressure at atm use 0.08206)

Sub in:
(203kPa)(10L)=n(8.31)(298)

Rearrange:
n= (203)(10) / (8.31)(298)
n = 0.819745mol in gas sample

8 0

3 years ago

Electrons

blondinia [14]

1840 times lesser than

Explanation:

Robert A. Milikan from his experiment found that electrons carry exactly one unit of negative charge and that its mass is 1840 times lesser than the mass of a common hydrogen atom.

Robert Milikan performed the oil drop experiment and was able to determine the charge on an electron.
From Milikan's experiment, the relative mass of an electron was discovered to be about 1840 times lesser than the mass of a hydrogen atom.
A normal hydrogen atom is a proton with an actual mass of 1.67 x 10⁻²⁷kg.
Electrons weight 9.11 x 10⁻³¹kg which is 1840 less than the weight of a proton.

Learn more:

electrons brainly.com/question/10887448

#learnwithBrainly

8 0

3 years ago

Solid iron sulfide combines with aqueous hydrogen chloride to form hydrogen sulfide gas and aqueous iron chloride.

KIM [24]

Answer:

Fe2S3 + 6HCl → 3H2S + 2FeCl3 is a double-displacement reaction

Explanation:

Step 1: The balanced equation

Fe2S3 + 6HCl → 3H2S + 2FeCl3

Step 2:

Decomposition: This is a reaction in which a compound breaks down into two or more simpler substances. Most decomposition reactions require an input of energy in the form of heat, light, or electricity.

The general form of a decomposition reaction is: AB→A+B

In our case, this is not a decomposition reaction.

Synthesis: This is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds, while the product is always a compound.

The general form of a decomposition reaction is: A + B → AB

In our case, this is not a synthesis reaction.

Single-displacement reaction: This is a reaction in which one element replaces a similar element in a compound. The general form of a single-replacement (also called single-displacement) reaction is:

A+BC→AC+B

In our case, this is not a single-displacement reaction.

Double - displacement reaction: This is a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds. The general form of a double-replacement (also called double-displacement) reaction is:

AB+CD→AD+B

In this reaction, A and C are positively-charged cations, while B and D are negatively-charged anions. Double-replacement reactions generally occur between substances in aqueous solution. In order for a reaction to occur, one of the products is usually a solid precipitate, a gas, or a molecular compound such as water.

In our case: There occurs a duble replacement between Fe^3+ and S^2- with H+ and Cl-.

Fe2S3 + 6HCl → 3H2S + 2FeCl3 is a double-displacement reaction

8 0

3 years ago

Consider the following selected postulates of Dalton's atomic theory: (i) Each element is composed of extremely small particles

slega [8]

Answer:

Explanation:

Dalton was the first scientist to propose an atomic model. He said that each element is composed of extremely small particles called atoms, which are indivisible, atoms of a given element are identical, and atoms of different elements have different properties.

With the advance of the studies, it was proven that elements are composed of small particles, atoms and that the atoms of each element are identical, and have different properties from atoms of different elements.

But, now we know that the atom can be divisible: it's formed by electrons, protons, and neutrons. So only postulate ii is no longer considered valid.

4 0

3 years ago