The periodic law is a law relating the properties of the element with their
atomic numbers.
The element is <u>potassium, K</u>.
Reason:
By atomic mass, potassium is 39.10 g, while argon is 39.10 g.
Going by the atomic mass alone, potassium should come before argon in
the periodic table and therefore should be an halogen and not an alkali
metal.
However, the number of protons in the potassium is 19, and therefore larger
than the number of protons in argon, which is argon.
Therefore, the element is <u>potassium, K</u>.
Learn more about the periodic law here:
brainly.com/question/2207821
Answer: 1 part is sulfuric acid is a catalyst
2 part is vanadium (V) oxide is a catalyst
Explanation:
Answer:
The volume that the sample of oxygen would occupy at 25 ° C if the pressure were reduced to 760.0 torr is 40.2 L
Explanation:
Boyle's law establishes the relationship between the pressure and the volume of a gas when the temperature is constant, so that the pressure of a gas in a closed container is inversely proportional to the volume of the container. That is, if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.
Boyle's law is expressed mathematically as:
Pressure * Volume = constant
or P * V = k
Considering an initial state 1 and a final state 2, it is true:
P1* V1= P2*V2
In this case:
- P1= 20.1 L
- V1= 1520 torr
- P2= 760 torr
- V2= ?
Replacing:
20.1 L* 1520 torr= 760 torr* V2
Solving:
V2= 40.2 L
<em><u>The volume that the sample of oxygen would occupy at 25 ° C if the pressure were reduced to 760.0 torr is 40.2 L</u></em>
<em><u></u></em>
Answer:
30.17 × 10²³ atoms
Explanation:
Given data:
Number of moles of lead = 5.01 mol
Number of atoms = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
In given question:
1 mole = 6.022 × 10²³ atoms
5.01 mol × 6.022 × 10²³ atoms / 1 mol
30.17 × 10²³ atoms
Answer:
100 degree celcius, because it is the melting point of ice ob
