Answer:
Option D
Explanation:
Hydronium ion concentration is a measure of pH of a solution.
The mathematical equation for the same is [H3O+] = 10-pH
OR
[H3O+] = antilog (- pH)
Hence, option D is correct
Answer:
666,480 Joules or 669.48 kJ
Explanation:
We are given;
- Volume of water as 2.0L or 2000 ml
but, density of water is 1 g/ml
- Therefore, mass of water is 2000 g
- Initial temperature as 20 °C
- Final temperature as 99.7° C
Required to determine the heat change
We know that ;
Heat change = Mass × Temperature change × specific heat
In this case;
Specific heat of water is 4.2 J/g°C
Temperature change is 79.7 °C
Therefore;
Heat change = 2000 g × 79.7 °C × 4.2 J/g°C
= 669,480 Joules 0r 669.48 kJ
Thus, the heat change involved is 666,480 Joules or 669.48 kJ
Answer:
The number of atoms of aluminum contained in one square inch of the foil=6
Explanation:
Interpretation:
The number of atoms of aluminum contained in one square inch of the foil is to be calculated.
Concept introduction: relation to calculate a number of atoms contained in one square inch of the foil is given by:
NA/c=mNA/AA1
Where,
M=mass of aluminum
NA= Avogadro's number
AA= Atomic mass of aluminum
Given :
Mass of aluminum foil=0.3 g
M= 0.39g
Relation to calculate a mass of atoms contained in one square inch of the foil is given by:
NA/c= mNA/AA1
M= Mass of aluminum
NA= Avogadro's number
AA= Atomic mass of aluminum
Since,
Avogadro's number
=6
