Answer:
50g
Explanation:
At the end of the burning process, the mass of the jar and smoke should be 50g after the candle burning is done.
In most systems, the law of conservation of matter finds expression. According to this law "matter is neither created nor destroyed but atoms are rearranged".
In this kind of system, no matter is allowed to escaped and the starting mass of the reactants compared to that of the product will be the same.
from what i can see the answer is C
Answer:
d. substance #5 in a gas at 78' F
Explanation:
Diffusion in substances simply has to do with the movement of the particles of a substance from one point to another.
The rate of diffusion varies in gases, liquids and solids. Gas molecules are usually more energetic than molecules of solids and liquids. Gases and are also in constant random motion at high velocities.
Therefore, substance #5 in a gas at 78' F will have the greatest diffusion rate.
Assume ideal gas behavior, then solve for the total number of moles:
PV = nRT
(5.50 atm)(10 L) = n(0.0821 L-atm/mol-K)(23+273 K)
n = 2.263 mol
Moles methane: 8 g ÷ 16.04 g/mol = 0.499 mol
Moles ethane: 18 g ÷ 30.07 g/mol = 0.599 mol
Moles propane: 2.263 - (0.499+0.599) = 1.165 mol
Applying Raoult's Law:
Partial pressure = Mole fraction * Total Pressure
<em>Partial Pressure of Methane = (0.499/2.263)(5.5 atm) = 1.21 atm</em>
<em>Partial Pressure of Ethane = (0.599/2.263)(5.5 atm) = 1.46 atm</em>
<em>Partial Pressure of Propane = (1.165/2.263)(5.5 atm) = 2.83 atm</em>
The metalloids are highlighted in the table.
Of the elements in the question, the following are metalloids...
<span>
antimony (Sb)</span><span>
silicon (Si)</span><span>
polonium (Po) </span>