The process that describes the transfer of heat through matter by activity of the molecules would be conduction. This type of heat transfer due to the motion of electrons and ions. within a body. As molecules collide with each energy is transferred and released which cause temperature to rise or drop.<span />
Answer:
The pH is 4.76
Explanation:
Step 1: Data given
Volume of a 0.476 M hydrocyanic acid solution = 29.8 mL = 0.0298 L
Volume of 0.487 M barium hydroxide solution = ?
Ka HCN = 6.2 * 10^-10
Step 2: Calculate pH
Hydrocyanic acid is a weak acid.
Barium hydroxide is a strong base.
The question asked = the pH BEFORE any base has been added, so we can ignore the base.
To calculate the pH of aweak acid, we need the pKa
HCN ⇔ H+ + CN-
Ka = [H+][CN-]/[HCN]
⇒ for weak acid: [H+]=[CN-]
Ka = [H+]²/[HCN]
[H+]² = [HCN]*Ka
[H+] = √([HCN]*Ka)
pH = -log(√([HCN]*Ka))
pH = -log(√(0.476 * 6.2*10^-10))
pH = 4.76
The pH is 4.76
The solution for the question is the following:
NaCO3(aq) + CaCl2 (aq) --> CaCO3 + Na2Cl(aq)
Na 2+(aq) + CO3 -2 (aq) +Ca+(aq) + 2Cl-(aq) ---> CaCO3 + Na 2+(aq) + 2Cl-(aq)
Ca2+ (aq) + CO3 2- (aq) → CaCO3 (s) would be the balanced net ionic equation.
The volume of Oxygen : 20,000 L
<h3>Further explanation</h3>
Given
400 L : initial volume
150 atm : initial pressure
3 atm : final pressure
Required
Final volume
Solution
Boyle's Law
At a fixed temperature, the gas volume is inversely proportional to the pressure applied
Input the value :
V₂ = (P₁V₁)/P₂
V₂ = 150 atm x 400 L / 3 atm
V₂ = 20,000 L
