<span>Silver is usually alloyed with copper to increase the
hardness and strength of sterling silver. Pure silver is relatively soft and
prone to tarnishing so other metals like those that copper is used to reduce
tarnishing and act as a solute in sterling silver. Copper is usually soluble in
most solvents.</span>
Answer:
ΔS Rx = -120, 5 J/K
Explanation:
The ΔS in a reaction is defined thus:
ΔS Rx = ∑ n S°products - ∑ m S°reactants
For the reaction:
N₂(g) + 2 O₂(g) → 2NO₂(g)
ΔS Rx = 2 mol × 240,5 
- [ 1 mol × 191,5 + 2 mol × 205,0 ]=
<em>ΔS Rx = -120, 5 J/K</em>
A negative value in ΔS means a negative entropy of the process. Doing this process entropycally unfavorable.
I hope it helps!
Answer:
soapy water is not good for plants irrigation that is what I learn
Answer: It has 52 protons
Moles of calcium metal used = 100/40.1=2.5
Moles of HBr need to react = 5 moles
As the molar ratio is 1 is to 2 among them
so
Moles=molarity x volume
5=2.25 x volume
volume=2.22 litres of HBr required for this reaction
ANSWER IS 2.22 LITRES
