Answer:
8.4 mol.
Explanation:
The pressure and temperature are constant. The only variables are the volume and number of moles, so we can use <em>Avogadro’s Law</em>:
The <em>volume of a gas is directly proportional to the number of moles</em>.
V = kn
or
V₂/V₁ = n₂/n₁ Multiply both sides by n₁ and transpose
n₂ = n₁ × V₂/V₁
n₁ = 2.00 mol; V₁ = 1.34 L
n₂ = ? mol; V₂ = 7.00 L Solve for V₂
n₂ = 2.00 × 7.00/1.34
n₂ = 2.00 × 5.223
n₂ = 10.4 mol
===============
The balloon originally held 2.00 mol of helium. It now holds 10.4 mol.
Moles added = 10.4 – 2.00
Moles added = 8.4 mol
Answer:
40 Newtons
Explanation:
4.218 is not even close to 40 N.
Smashing the cube into pieces
Explanation:
Smashing the cube into pieces will most likely increase the reaction rate between the manganese oxide and hydrogen peroxide.
The rate of a chemical reaction is a measure of the speed of a chemical reaction.
Some factors that affects the rate of chemical reaction are:
- Nature of the reactants
- Concentration of the reactants or pressure if gases.
- Temperature
- Presence of a catalyst.
- Sunlight(some reactions are light catalyzed)
- The nature of reactants implies the physical state of matter, bond type or surface area exposed of reacting species.
- The surface area exposed is directly proportional to the reaction rate.
- Breaking the cubes into smaller pieces exposes more surface area to the chemical action and the reaction rate increases.
Learn more:
Activation energy brainly.com/question/3930233
#learnwithBrainly
Answer:
The biggest risk with recharging alkaline batteries is leakage. As you probably know, alkaline batteries leak even under normal circumstances. Internal off gassing, made worse by heat, creates pressure that can breach battery seals. Therefore, the risk of leakage is an even bigger risk when recharging.