Answer:
B
Explanation:
In order to create spontaneity, an endothermic process has to occur along with positive entropy and high temperature
When two forces act on an object in opposite directions, the net force can be calculated by subtracting the two forces.
<u>Explanation:</u>
- The net/final force by subtracting the two given opposite forces as asked in the above question.
For example: If you keep a bottle on the table, the downward force subtracted from the upward force will be equal to the net force.
- If the net force equals zero then the objects will be balanced, otherwise unbalanced.
For example: In the tug of war when two forces are of different units the force with the greater strength will have an advantage, like if the team on the right is stronger than that of left than the rope will move towards the right.
Answer : The empirical formula of a compound is,
Solution : Given,
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of Na = 53.976 g
Mass of B = 8.461 g
Mass of O = [100 - (53.976 + 8.461)] = 37.563 g
Molar mass of Na = 23 g/mole
Molar mass of B = 11 g/mole
Molar mass of O = 16 g/mole
Step 1 : convert given masses into moles.
Moles of Na =
Moles of B =
Moles of O =
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For Na =
For B =
For O =
The ratio of Na : B : O = 3 : 1 : 3
The mole ratio of the element is represented by subscripts in empirical formula.
The Empirical formula = =
Answer:
A physical property is a characteristic of matter that is not associated with a change in its chemical composition.Examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. We can observe some physical properties, such as density and color, without changing the physical state of the matter observed.
Explanation:
According to the Henderson-Hasselbalch equation,
pH = +
Given values are pH = 6, = 8
Putting given values into the above equation as follows.
6 = 8 +
= -2
= antilog -2
= 0.01
But according to the question, we need protonated to deprotonated ratio of
=
= 100
Thus, we can conclude that ratio of the protonated to the deprotonated form of the acid is .