Answer:
394.05g of KO2
Explanation:
First, let us calculate the number of moles of O2 produced. This is illustrated below:
V = 100L
P = 1atm
T = 20°C = 20 +273 = 293K
R = 0.082atm.L/K /mol
n =?
PV = nRT
n = PV /RT
n = (1 x 100)/(0.082 x 293)
n = 4.16moles of O2
4KO2 + 2CO2 → 2K2CO3 + 3O2
From the equation,
4moles of KO2 produced 3moles of O2.
Therefore, xmol of KO2 will produce 4.16moles of O2 i.e
xmol of KO2 = (4.16 x 4)/3 = 5.55moles.
Converting 5.55moles O KO2 to grams, we have:
Molar Mass of KO2 = 39 + (2x16) = 39 + 32 = 71g/mol
Mass of KO2 = 5.55 x 71 = 394.05g
Therefore, 394.05g of KO2 is needed for the reaction
Answer:
moles of Cu° needed = ½ (5.8 moles) = 2.9 moles Cu° needed.
Explanation:
Cu + 2AgNO₃ => Cu(NO₃)₂ + 2Ag
? moles Cu + 5.8 moles AgNO₃ => Cu(NO₃)₂ + 2Ag
<u>Note coefficient of Cu° vs coefficient of AgNO₃ </u>
=> 1 mole Cu° < 2 moles AgNO₃ ...
=> Since moles of Cu° are smaller than moles of AgNO₃ in the given equation, the moles of Cu° needed to react with 5.8 moles AgNO₃ will be smaller than the 5.8 by the ratio of coefficients that will make 5.8 smaller. That is ...
moles of Cu° needed = ½ (5.8 moles) = 2.9 moles Cu° needed.
Note: Using 2/1(5.8) will make value greater than 5.8 and incorrect.
One can also set up a ratio relationship as follows...
1 mole Cu° <=> 2 moles AgNO₃ (fm equation)
? mole Cu° <=> 5.8 moles AgNO₃ (problem)
=> (1 mole Cu°)/X=(2 mole AgNO₃)/(5.8 moles AgNO₃)
=> X = (1 mole Cu°)(5.8 mole AgNO₃)/2 mole AgNO₃
= ½(5.8) mole Cu° = 2.9 mole Cu°
Answer:
22)convex
23)sun (sunlight reflect of the off the surface of the moon
24)because of the way the atmosphere interacts with sunlight
25) transparent : glass,contact lenses,water,air
translucent: wax paper, oil paper, thin sheets
opaque : plastic, wood, leather
26)when light react with opaque: none of it passes though
when it reacts with transparent : it passes through
when it react with translucent : only some of it passes through, the light does not pass directly through the material
Explanation:
24 blue light is scattered in all directions by the tiny molecules of air in earth's atmosphere
Answer:sNo, Air is not an element It's a mixture of a variety of gases.
Explanation:
Answer:
Melting
Explanation:
From solid to liquid, the change of state happening is the melting process. The kinetic energy of the particles that makes up the solid is increased and it allows the liquid to flow.
- A solid is a fixed mass with static molecules.
- When thermal energy is added, the kinetic energy increases.
- The kinetic energy of the particles increases and they vibrate about their fixed point in solids.
- This eventually breaks the structure and liquid which begins to flow forms.
This is a melting process.