Answer:
$18.30
Explanation:
The change is the amount left over after the selling price has been matched by the buyer.
Let us find the total cost of what of Ms. Kuhn bought;
For the shirt;
Cost = 4 shirts for $15.95 each = 4(15.95) = $63.8
2 new belts for $8.95 each = 2(8.95) = $17.9
Total cost = $63.8 + $17.9 = $81.7
The amount of change left = $100 - $81.7 = $18.3
Answer:
shift to restore equilibrium
Explanation:
Le Châtelier's Principle states that when a stress is applied to a system at equilibrium, the system will respond by shifting in the direction (either towards the products or reactants side) that opposes/ minimizes the effect of the stress.
Note that although the system tries to restore equilibrium, this equilibrium is a new equilibrium.
Equilibrium is the state of a reversible reaction when:
• two opposing reactions occur at the same rate;
• the concentrations of reactants and products are constant
Answer:
755.625 kj
Explanation:
Given data:
Heat released by two mole of H₂ = 241.8 Kj
Heat released by 12.5 grams of H₂ = ?
Solution:
Number of moles of hydrogen:
Number of moles = mass/ molar mass
Number of moles = 12.5 g/ 2 g/mol
Number of moles = 6.25 mol
Chemical equation:
2H₂ + O₂ → 2H₂O + 241.8 kj
Now we will determine the heat released by 6.25 moles of hydrogen.
2 mole = 241.8 kj
1 mole =241.8 kj/2 = 120.9 kj
120.9 kj × 6.25 = 755.625 kj
1. The mass of unstable isotope would be left in 2 hours is 50 g
2. The mass of unstable isotope would be left in 4 hours is 25 g
3. The mass of unstable isotope would be left in 10 hours is 3.125 g
<h3>1. How to determine the mass after 2 hours</h3>
We'll begin by calculating the number of half-lives that has elapsed.
- Half-life (t½) = 2 hours
- Time (t) = 2 hours
- Number of half-lives (n) =?
n = t / t½
n = 2 / 2
n = 1
Finally, we shall determine the mass remaining.
- Original amount (N₀) = 100 g
- Number of half-lives (n) = 1
- Amount remaining (N) = ?
N = N₀ / 2ⁿ
N = 100 / 2¹
N = 50 g
<h3>2. How to determine the mass after 4 hours</h3>
We'll begin by calculating the number of half-lives that has elapsed.
- Half-life (t½) = 2 hours
- Time (t) = 4 hours
- Number of half-lives (n) =?
n = t / t½
n = 4 / 2
n = 2
Finally, we shall determine the mass remaining.
- Original amount (N₀) = 100 g
- Number of half-lives (n) = 2
- Amount remaining (N) = ?
N = N₀ / 2ⁿ
N = 100 / 2²
N = 25 g
<h3>3. How to determine the mass after 10 hours</h3>
We'll begin by calculating the number of half-lives that has elapsed.
- Half-life (t½) = 2 hours
- Time (t) = 10 hours
- Number of half-lives (n) =?
n = t / t½
n = 10 / 2
n = 5
Finally, we shall determine the mass remaining.
- Original amount (N₀) = 100 g
- Number of half-lives (n) = 5
- Amount remaining (N) = ?
N = N₀ / 2ⁿ
N = 100 / 2⁵
N = 3.125 g
Learn more about half life:
brainly.com/question/26374513
#SPJ1