Tha atomic number of an atom that has 3 protons and 4 neutrons is 3. It's the lithium
The pressure of the vessel at a temperature of 25 °C is 106.73 KPa
We'll begin by calculating the number of mole of fluorine gas. This can be obtained as follow:
Mass of F₂ = 6.40 g
Molar mass of F₂ = 19 × 2 = 38 g/mol
<h3>Mole of F₂ =? </h3>
Mole = mass / molar mass
Mole of F₂ = 6.40 / 38
<h3>Mole of F₂ = 0.168 mole </h3>
Finally, we shall determine the pressure. This can be obtained as follow:
Volume (V) = 3.90 L
Temperature (T) = 25.0 °C = 25 + 273 = 298 K
Mole of F₂ (n) = 0.168 mole
Gas constant (R) = 8.314 L.KPa/Kmol
<h3>Pressure (P) =? </h3>
PV = nRT
P × 3.9 = 0.168 × 8.314 × 298
P × 3.9 = 416.232096
Divide both side by 3.90
P = 416.232096 / 3.90
<h3>P = 106.73 KPa </h3>
Therefore, the pressure of the vessel is 106.73 KPa
Learn more: brainly.com/question/15688935
Answer:
16.74×10²³ atoms
Explanation:
Given data:
Number of moles of X = 2.78 mol
Number of atoms = ?
Solution:
According to Avogadro number.
1 mole of any substance contain 6.022×10²³ atoms. Thus,
2.78 mol × 6.022×10²³ atoms / 1 mol
16.74×10²³ atoms
The number 6.022 × 10²³ is called 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.
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
Atoms in a covalent bond are joined together by electrostatic forces<span> of attraction which occurs between positively charged and negatively charged electrons that are shared.
Therefore the answer is CO2 or D because carbon dioxide is a covalent compound.</span>
