Answer:
5 (five)
Explanation:
In
, the number of valence electrons of phosphorus is five while that of each of the oxygen atom is six. The oxygen atoms form three single bonds and a single double bond with the phosphorus. Therefore, the number of covelent bonds around the compound in order to ensure that the dot structure can expand the octet to reduce the formal charge is 5 (five).
Answer:
The mass of solid copper chloride used in each experiment=15 g
Explanation:
We are given that
Mass of copper chloride in solution=300g/dm3
Volume of solution used in each experiment=50 cm3
We have to find the mass of solid copper chloride used in each experiment.
![1cm^3=0.001 dm^3](https://tex.z-dn.net/?f=1cm%5E3%3D0.001%20dm%5E3)
![50cm^3=0.05 dm^3](https://tex.z-dn.net/?f=50cm%5E3%3D0.05%20dm%5E3)
1 dm3 contained solid copper chloride=300 g
0.05 dm3 contained solid copper chloride=
g
0.05 dm3 contained solid copper chloride=15 g
Hence, the mass of solid copper chloride used in each experiment=15 g
Answer (4)
Endothermic processes: are those in which occurs the absorption of heat.
the change of enthalpy (ΔH) is greater <span>than zero.
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hope this helps!
Answer:
Option E is the correct one
Explanation:
K₂Cr₂O₇ → Potassium dichromate
A ionic salt which its molar mass is 294.18 g/m
It is composed by 2 mol of K, 2 mol of Cr and 7 mol of O
2 mol of K = 78.2 g
2 mol of Cr = 104 g
7 mol of O = 112 g
In 294.2 g of compound we have __78.2 g K __ 104 g Cr ___ 112 g O
Let's calculate the percent
(78.2 / 294.2) .100 = 26.59% K
(104 / 294.2) .100 = 35.35% Cr
(112 / 294.2) . 100 = 38.06 % O
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