I believe the answer is A the 1st one
Answer:
The correct answer is - option D. the boiling point of solution A will be lower than the boiling point of solution B
Explanation:
Colligative properties such as a decrease in the freezing point of the solution, increase in the boiling point of substance, decrease in Lowering of vapor pressure, and other properties depend upon the number of molecules only.
In the given solution the equal amount of two solutions are mixed that is 50 grams however due to the difference in the molecular mass so the atoms present in both solution A and B will be different. It is known that the number of atoms of a substance is inversely proportional to the molecular mass of the particular substance.
As it is given that Solution B has a low molecular mass which means it has a high number of atoms that means its boiling point will be higher than solution A.
The moles can be defined as the mass of the substance with respect to molar mass. The moles of potassium nitrate is 1 mol.
<h3>How to calculate moles of a substance?</h3>
The moles of a compound can be calculated from:
![\rm Moles=\dfrac{Mass}{Molar\;mass}](https://tex.z-dn.net/?f=%5Crm%20Moles%3D%5Cdfrac%7BMass%7D%7BMolar%5C%3Bmass%7D)
The molarity can be defined as the moles of solute in a liter of solution.
The molarity can be expressed as:
![\rm Molarity=\dfrac{Moles\;\times\;1000}{Volume\;(mL)}](https://tex.z-dn.net/?f=%5Crm%20Molarity%3D%5Cdfrac%7BMoles%5C%3B%5Ctimes%5C%3B1000%7D%7BVolume%5C%3B%28mL%29%7D)
The molarity of potassium nitrate solution is 2 M, and the volume is 500 mL.
The moles of potassium nitrate is given as:
![\rm 2\;M=\dfrac{Moles\;\times\;1000}{500\;mL}\\ Moles=\dfrac{2\;\times\;500}{1000}\;mol\\ Moles=1\;mol](https://tex.z-dn.net/?f=%5Crm%202%5C%3BM%3D%5Cdfrac%7BMoles%5C%3B%5Ctimes%5C%3B1000%7D%7B500%5C%3BmL%7D%5C%5C%20Moles%3D%5Cdfrac%7B2%5C%3B%5Ctimes%5C%3B500%7D%7B1000%7D%5C%3Bmol%5C%5C%20Moles%3D1%5C%3Bmol)
The moles of potassium nitrate in 2 M, 500 mL solution are 1 mol.
Learn more about moles, here:
brainly.com/question/15209553
Answer:
d= 50.23 g/cm³
Explanation:
Given data:
radius = 137.9 pm
mass is = 5.5 × 10−22 g
density = ?
Solution:
volume of sphere= 4/3π r³
First of all we calculate the volume:
v= 4/3π r3
v= 1.33× 3.14× (137.9)³
v= 1.33 × 3.14 × 2622362.939 pm³
v= 1.095 × 10∧7 pm³
v= 1.095 × 10∧-23 cm³
Formula:
Density:
d=m/v
d= 5.5 × 10−22 g/ 1.095 × 10∧-23 cm³
d= 5.023 × 10∧+1 g/cm³
d= 50.23 g/cm³
Answer:
Atom 3
Explanation:
Protons have a +1 charge, electrons have a -1 charge, and neutrons have no charge and are therefore neutral. The charges will cancel each other when equal. To determine which atom has the a -1 charge, find the atom that has one more electron than it has protons.