Answer:
Friction
Explanation:
Friction is the name of the force that opposes motion.
Answer:
Explanation:
Hello,
In this case, given the reaction, the molar mass of ethene is 28 g/mol and the molar mass of carbon dioxide is 44 g/mol. With that information we compute the theoretical yield considering a 1:2 molar ratio respectively between them:
Thus, we compute the percent yield with the given grams of carbon dioxide:
Regards.
Rb
Explanation:
Rb is an element in Period 5 that is the most active metal from the given choices.
The first group on the periodic table are made of highly reactive metals due to their large electropositivity.
Electropositivity or metallicity is a measure of the tendency of atoms of an element to lose electrons.
As we go from left to right on the periodic table, electropositivity decreases.
Therefore, in period 5, we have elements: Rb Sr, Rb is more reactive and most active of the two.
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There are at least two ways to look at this.
Method One :
The Zn in Zinc Cyanide belongs to valency two while the CN radical
belongs to valency one. As a result, you would need two CN radicals
to bond with the Zn to make it a stable compound. Hence the formula
being Zn(CN)₂
Method Two :
Since the mole of zinc is 4.7 mol and that of CN is 9.5 mol then that
means that there is twice as much moles of CN as there is Zinc
4.7 mol × 2 = 9. 4 mol. Thus the formula would be Zn(CN)₂