Answer:
<h2>1.8 g</h2>
Explanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question
volume = 3 cm³
density = 0.6 g/cm³
We have
mass = 0.6 × 3 = 1.8
We have the final answer as
<h3>1.8 g</h3>
Hope this helps you
Answer:
12 moles of F₂
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
N₂ + 3F₂ —> 2NF₃
From the balanced equation above,
3 moles of F₂ reacted to produce 2 moles of NF₃.
Finally, we shall determine the number of mole of F₂ needed to produce 8 moles of NF₃. This can be obtained as illustrated below:
From the balanced equation above,
3 moles of F₂ reacted to produce 2 moles of NF₃.
Therefore, Xmol of F₂ will react to produce 8 moles of NF₃ i.e
Xmol of F₂ = (3 × 8)/2
Xmol of F₂ = 12 moles
Thus, 12 moles of F₂ is needed for the reaction.
Answer:
K = 8x10¹⁸
Explanation:
<em>When you sum a reaction, the result of this sum has a K equal to the multiplication of the K's of the reactions involved in the sum</em>
<em />
The sum of two times the reaction:
NaO(g) ⇌ Na(l) + 1/2 O₂(g) K₂ = 2x10⁻⁵
2 NaO(g) ⇌ 2 Na(l) + O₂(g) K = K₂ₓK₂ = (2x10⁻⁵)² = 4x10⁻¹⁰
The result of the inverse reaction:
Na₂O₂(s) ⇌ 2 Na(l) + O₂(g) K₃= 5x10⁻²⁹
2 Na(l) + O₂(g) ⇌ Na₂O₂(s) K = 1/K₃ = 2x10²⁸
And the sum of the two bolded reactions:
2 NaO(g) + 2 Na(l) + O₂(g) ⇌ 2 Na(l) + O₂(g) + Na₂O₂(s)
2 NaO(g) ⇌ Na₂O₂(s) K = 4x10⁻¹⁰× 2x10²⁸
<h3>K = 8x10¹⁸</h3>
Answer:
You have to use a sufficient amount of heat, to make a zinc plated copper penny into a gold color
There are also 7 detailed steps you can use if you are tryin got make gold pennies
1.Pour 20 mL of NaOH solution to the dish.
2.Add the zinc dust in the dish with the NaOH, and gently swirl the mixture together.
3.Set the hot plate to medium heat and place the evaporating dish on top.
4.Heat for 5 minutes. Do not boil. When the dish is hot, place a penny in it. Heat for two minutes or until the penny is coated and becomes silver in appearance.
5.Remove the penny from the dish with tongs and drop it into water. When cool, wipe the penny clean with a cloth to remove any excess zinc.
6.Using tongs, hold the penny in the flame of a Bunsen burner and gently heat. The penny should turn “gold” (brass). (Do not overheat the penny.)
7.Dip the penny in the beaker of water until it is cool to the touch.