Answer:
19.8% of Nitrogen
Explanation:
In the Al(NO₃)₃ there are:
1 atom of Al
3 atoms of N
And 9 atoms of O
The molar mass of Al(NO₃)₃ is:
1 Al * (26.98g/mol) = 26.98g/mol
3 N * (14g/mol) = 42g/mol
9 O * (16g/mol) = 144g/mol
26.98 + 42 + 144 = 212.98g/mol
We can do a conversion using these molar masses to find the mass of nitrogen is the sample, that is:
2.57g * (42g/mol / 212.98g/mol) =
0.51g N
Percent composition of nitrogen is:
0.51g N / 2.57g * 100
= 19.8% of Nitrogen
Correct answer is option E. <span>It is a redox reaction in which Zn is oxidized at the anode, and V is reduced at the cathode.
Reason:
In above reaction, the oxidation state of VO3- is +5, while that of VO2 is +4. Thus there is reduction of V from +5 to +4
In case of Zn, oxidation state of Zn is increased from 0 to +2, Thus process is referred as oxidation. </span>
I believe it's (C) Endothermic reaction
Explanation:
When energy is absorbed in an endothermic reaction, the temperature decreases.
The two claims about the cause of the Hindenburg explosion were:
- The origin of the fire was the initial fuel as well as its source of ignition.
- The Americans proposed that the rapidly spreading fire was most likely caused by an electrical phenomena known as a "brush discharge," which sparked leaking hydrogen.
<h3>What was the Hindenburg explosion about?</h3>
The German passenger airship LZ 129 Hindenburg caught fire and was destroyed on May 6, 1937, when it attempted to dock with its mooring tower at Naval Air Station Lakehurst in Manchester Township, New Jersey, in the United States.
The investigations concerning the disaster were carried out by the American and German governments, who respectively published their results in July 1937 and January 1938.
Both came to the same conclusion that the accident had been caused by atmospheric circumstances that wet evening, however they disagreed on the precise process. Hugo Eckener's initial spark idea was well-liked in Germany.
Therefore, the claims above are correct.
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