Questions are as follow, and answered one by one,
(1) What is step 1 in solving the problem?
Answer:
First of all moles of NaOH are calculated. This is done by applying following formula,
Moles = n = Mass / M.mass
(2) What is the molar mass of NaOH?
Answer:
Add all atomic masses of elements in NaOH to find the Molar mass.
Atomic Mass of Na = 22.98 g/mol
Atomic Mass of O = 16.00 g/mol
Atomic Mass of H = 1.008 g/mol
_______________
Molar Mass of NaOH = 39.988 g/mol
<span>(3) What is the Molarity of this solution?
</span>
Answer:
Molarity = Moles / Vol
∴ Moles = 40g / 39.988g/mol = 1.0 mol
So,
Molarity = 1.0 mol / 6.0 L
Molarity = 0.16 mol.L⁻¹
Answer:
Explanation:
a ) false.
NH₃ is more polar molecule than PH₃ so inter-molucular attraction is greater in NH₃ ( hydrogen bond ) . Hence vapour pressure is low for NH₃ .
b ) false .
The average kinetic energy of boiling water molecules is lower on a mountaintop than it is at sea level. It is so because water boils at lower temperture on mountain and kinetic energy of molecules depends upon temperature .
c ) false
vapour pressure depends upon temperature .
d ) True
CCl4 is more volatile than CBr4
e ) false
vapour pressure increases as temperature increases.
The configuration for chlorine is: Cl <span>1s2 2s2</span><span> 2p</span>6 <span>3s2</span><span> 3p</span>5<span> or the abbreviated method is: Cl [Ne] </span><span>3s2</span><span> 3p</span>5<span>.</span>
Mình nghĩ C là đáp án đúng
<span>Distillation, filtration, evaporation are some of the techniques by which mixtures can be resolved into their components.Distillation is the process of separating the component or substances from a liquid mixture by selective evaporation and condensation.Filtration is any of various mechanical, physical or biological operations that separate solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance.</span>