<u>Answer:</u> The molarity of solution is 0.34 M.
<u>Explanation:</u>
- To calculate the number of moles, we use the equation:
<u>For lead chloride:</u>
Given mass of lead chloride = 18.86 g
Molar mass of lead chloride = 278.1 g/mol
Putting values in above equation, we get:
- For the balanced chemical equation:
By Stoichiometry of the reaction:
1 mole of lead chloride is formed by 1 mole of lead nitrate
So, 0.068 moles of lead chloride will be formed from = of lead nitrate
- To calculate the molarity of solution, we use the equation:
We are given:
Volume of solution = 200 mL = 0.200 L (Conversion factor: 1 L = 1000 mL)
Moles of lead nitrate = 0.068 moles
Putting values in above equation, we get:
Hence, the molarity of solution is 0.34 M.
Pressure in the submarine when the temperature is changed to 293 K is 108.9 K Pa
Explanation:
Pressure in the submarine = 108.9 kPa
Volume, V = 2.4 * 10^5 L
Pressure, P = 116k Pa
Temperature, T = 312 K
Ideal gas law: PV = nRT or n = PV / RT
So, moles of gas, n =116 KPa * 2.4 * 10 ^5L / 8.314 LK Pa K^-1 *312 K
= 1.073 *10^4 mol
when temperature is changed to 293K,
PV = nRT or P = nRT / V
=1.073 *10^4 mol *8.314 LK Pa mol^-1 K^-1 *293 K / 2.4*10^5L
=108.9 K Pa
Pressure in the submarine when the temperature is changed to 293 K is 108.9 K Pa
Answer:
The volume of is equal to 720 cm³.
Explanation:
We know that,
1 m = 100 cm
We need to convert to cm³.
Also,
1 m³ = 10⁶ cm³
To convert to cm³, the step is as follows :
So, is equal to 720 cm³.
The metalloids are highlighted in the table.
Of the elements in the question, the following are metalloids...
<span>
antimony (Sb)</span><span>
silicon (Si)</span><span>
polonium (Po) </span>
Answer:
A neutral atom of Cobalt (Co) has an atomic number of 27 and an atomic mass of 59. Therefore, Co has 27 electrons, 27 protons and 32 neutrons.
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
The atomic number Co is 27 it means it has 27 protons and 27 electrons.
The mass number is sum of protons and neutrons, thus number of neutrons are
59 - 27 = 32 neutrons