Density can be calculated using the following rule:
density = mass / volume
Therefore,
volume = mass / density
For diamond:
we have mass = 0.5 grams and density = 3.51 g / cm^3
Substituting in the rule, we can calculate the volume of diamond as follows:
volume = 0.5 / 3.51 = 0.14245 cm^3
For graphite:
we have mass = 0.5 grams and density = 2.25 g / cm^3
Substituting in the rule, we can calculate the volume of graphite as follows:
volume = 0.5 / 2.25 = 0.2223 cm^3
The number of moles is given by:
Mass of hydrogen, = (given)
Molar mass of hydrogen, =
Number of moles of hydrogen, =
Reaction between to form is:
From the reaction it is clear that 3 moles of hydrogen gives 2 moles of ammonia and 1 mole of nitrogen gives 2 moles of ammonia .
So, of gives:
Number of moles of ammonia, =
Since, in one mole of ammonia, there are molecules of ammonia, .
So, number of molecules in of ammonia, is:
Hence, the number of molecules of ammonia produced by of is .
Answer:
-514 kJ/mol
Explanation:
The bond enthalpy which is also known as bond energy can be defined as the amount of energy needed to split one mole of the stated bond. The change in enthalpy of a given reaction can be estimated by subtracting the sum of the bond energies of the reactants from the sum of the bond energies of the products.
For the given chemical reaction, the change in enthalpy of the reaction is:
Δ [2(409) + 4(388) + 3(496) - 4(630) - 4(463)] kJ/mol = 818 + 1552 + 1488 - 2520 - 1852 = -514 kJ/mol
Answer:The outer shell of the Earth is a series of large blocks called the tectonic plates. Though the surface of the Earth appears to be still, it is actually moving all the time. And, it is this movement of these plates that is responsible for earthquakes, volcanic eruptions, and the formation of mountains on the Earth’s surface.
Explanation:
Answer: The Answer is B
Explanation:
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