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Answer:
Antoine Lavoisier and Johann Wolfang Döbereiner organized the elements based on properties such as how the elements reacts or whether they are solid or liquid.
Explanation:
The periodic table of the elements as we have it today was developed as a result of the work of several notable centuries who lived centuries apart, all of who made notable contributions to development of the modern periodic table in use today.
In 1789, Antoine Lavoisier, a French Chemist provided a definition of elemets which he defined as a substance whose smallest units cannot be broken down into a simpler substance. He further grouped the elements into two as metals and nonmetals.
In 1829, German physicist Johann Wolfang Döbereiner arranged elements in groups of three in increasing order of atomic weight and called them triads. His arrangement owasf elements into triads was based on his observation of similarities in physical and chemical properties of certain elements.
John Newlands, a British Chemist was the first to arrange the elements into a periodic table with increasing order of atomic masses.
In 1869, Russian chemist Dmitri Mendeleev developed a periodic table which provided a framework the modern periodic table. He arranged the elements according to their atomic weight, leaving gaps for elements that were yet to be discovered.
The modern periodic table arranges elements based on increasing atomic number.
Answer:
0.712 mol of NO₂ are formed .
Explanation:
For the reaction , given in the question ,
2 N₂O₅ ( g ) → 4 NO₂ ( g ) + O₂ ( g )
From the above balanced reaction ,
2 mol of N₂O₅ reacts to give 4 mol of NO₂
Applying unitary method ,
1 mol of N₂O₅ reacts to give 4 / 2 mol of NO₂
From the question , 0.356 mol of N₂O₅ are reacted ,
<u>now, using the above equation , to calculate the moles of the NO₂ , as follow -</u>
Since ,
1 mol of N₂O₅ reacts to give 4 / 2 mol of NO₂
0.356 mol of N₂O₅ reacts to give 4 / 2 * 0.356 mol of NO₂
Calculating ,
0.712 mol of NO₂ are formed .
