Answer:
3+
Explanation:
i looked up the answer :)
<span>the balanced equation for the reaction is as follows ;
Na</span>₂S + 2AgNO₃ ---> 2NaNO₃ + Ag₂<span>S
stoichiometry of Na</span>₂S to AgNO₃<span> is 1:2
number of AgNO</span>₃<span> moles reacted - 0.315 mol/L x 0.04000L = 0.0126 mol according to molar ratio of 1:2
number of Na</span>₂S moles required are - 1/2 x number of AgNO3 moles reacted Na₂<span>S moles = 0.0126 mol /2 = 0.00630 mol
molarity of Na</span>₂<span>S - 0.260 M
there are 0.260 mol in 1 L
therefore 0.00630 mol are in - 0.00630 mol / 0.260 mol/L
volume of Na</span>₂<span>S required = 0.0242 L
volume of Na</span>₂S required = 24.4 mL
Answer:
Hydrogen gas is evolved at the cathode and chlorine gas at the anode.
Explanation:
The solution will ionise. Hydrogen ions, H+, will migrate to the negative cathode ( where the current leaves the solution and chloride ions Cl- will migrate the the positive anode.
Explanation:
An extensive mountain range can cause a large desert area.
Mountains are usually geologic features that have heights that are greater than 600m.
- Due to towering heights of mountains, they have serious effect on the weather and climatic pattern in an area.
- Air masses that are warm are usually moisture laden.
- As they try to cross the steep slopy side of one mountain, their pressure reduces and they drop the vapor in them causing rainfall.
- The cold wind moves to the other side.
- This side is called the leeward side.
- Cold air is dry and lacks moisture.
- This can lead to the formation of a desert.
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Total weight of alloy is
67 + 20 = 87 g
67 g of which is gold
So % gold is 67/87* 100 = 77.01%
