Answer:
B
Explanation:
since isotopeA has bigger mass number
The pH of the solution : 12
<h3>Further explanation</h3>
Reaction
HCOOH + NaOH ⇒ HCOONa + H₂O
mol HCOOH =
![\tt 20~ml\times 0.2~M=4~mlmol](https://tex.z-dn.net/?f=%5Ctt%2020~ml%5Ctimes%200.2~M%3D4~mlmol)
mol NaOH =
![\tt 25~ml\times 0.2~M=5~mlmol](https://tex.z-dn.net/?f=%5Ctt%2025~ml%5Ctimes%200.2~M%3D5~mlmol)
Mol NaOH>mol HCOOH ⇒ at the end of the reaction there will be a strong base remains from mol NaOH, so that the pH is determined from [OH⁻]
ICE method :
HCOOH + NaOH ⇒ HCOONa + H₂O
4 5
4 4 4 4
0 1 1 1
Concentration of [OH⁻] from NaOH :
![\tt \dfrac{1~mlmol}{20+25~ml}=0.02](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B1~mlmol%7D%7B20%2B25~ml%7D%3D0.02)
pOH=-log[OH⁻]
pOH=-log 10⁻²=2
pH+pOH=14
pH=14-2=12
An equation is the symbolic representation of a chemical reaction based on the conservation of mass.
The law of conservation of mass states that mass can neither be created nor it can be destroyed. The volume and the density of the matter may be changing but mass will remain constant. Or it could be represented by a balanced chemical equation, which is a chemical equation that shows all mass is conserved during the entirety of the reaction. For example, N_{2} + H_{2} -----> NH _{3} is an unbalanced chemical equation. In order to balance the said equation, we need to add coefficients to equalize the number of atoms on both the reactants and product sides. This will give us a new equation and that is N_{2} + 3H_{2} -----> 2NH _{3}. Through this the mass of the atoms are conserved.
Answer:
C
Explanation:
The high specific heat capacity of water means that it takes much more energy to raise the temperatures of water by one (1) degree than land. This means that on a hot sunny day, land temperatures would increase dramatically while ocean temperatures would only rise slightly. Conversely, at night, the land cools rapidly while oceans cool slowly hence the temperatures drop slightly.