Answer:
112.540 gram of N2
Explanation:
From the balanced chemical equation
N2+3H2----->2NH3
It means that 1 mole of Nitrogen needs 3 moles of hydrogen
In term of mass,we can say that
6.048 gram of H2 needs 28.01 gram of N2
or, 1 gram of H2 needs (28.01/6.048) gram of N2
and 24.3gram of H2 needs (24.3*28.01/6.048) gram of N2
=112.540 gram of N2
Solar energy will not run out (unless the sun burns out), but the supply of fossil fuels we use is slowly depleting. Burning fossil fuel also releases greenhouse gas into the air, which is bad for the atmosphere.
Answer:
The enthalpy of combustion of ethanol in kJ/mol is -1419.58 kJ/mol.
Explanation:
The heat absorbed by the bomb and water is equal to the product of the heat capacity and the temperature change. Working with this equation, and assuming no heat is lost to the surroundings, we write
:
qcal= Ccal × ΔT= 490 J/K × 276.7 K= <u>135,583 J</u> = 135.58 kJ
Note we expressed the temperature change in K, because the heat capacity is written in K.
<u>
Now that we have the heat of combustion, we need to calculate the molar heat. </u>
Because qsystem = qrxn + qcal and qrxn = -qcal, the heat change of the reaction is -135.58 kJ.
This is the heat released by the combustion of 4.40 g of ethanol ; therefore, we can write the <u>conversion factor as 135.58 kJ/ 4.40 g</u>.
The molar mass of ethanol is 46.07 g, so the heat of combustion of 1 mole of ethanol is
:
molar heat of combustion= -135.58 kJ/4.40 g x 46.07 g/ 1 mol= -1419.58 kJ/mol
Therefore, the enthalpy of combustion of ethanol in kJ/mol is -1419.58 kJ/mol.
Answer :
The key differences between a liquid and the a gas is,
A liquid has no fixed shape but it has a volume.
A gas has neither a fixed shape nor a volume.
A liquid has more inter-molecular space between the molecules.
A gas has larger inter-molecular space between the molecules as compared to the liquids.
- Inter-molecular attraction :
A liquid has some Inter-molecular attraction between the molecules because of the low Inter-molecular spacing between the molecules.
A gas has very low or minimum Inter-molecular attraction between the molecules because of the larger Inter-molecular spacing between the molecules.
A liquid flow from the higher to the lower region but a gas flow in all the direction.
Answer :
(a)
In this Lewis dot structure, there are 3 bond pair and 0 lone pair on the central atom. The total number of electron pair is 3. So, the hybridization of the molecule will be, and the geometry will be, trigonal planar.
(b)
In this Lewis dot structure, there are 4 bond pair and 0 lone pair on the central atom. The total number of electron pair is 4. So, the hybridization of the molecule will be, and the geometry will be, tetrahedral.
(c)
In this Lewis dot structure, there are 3 bond pair and 1 lone pair on the central atom. The total number of electron pair is 4. So, the hybridization of the molecule will be, but the the fourth position will be occupied by one lone pair. Hence, the geometry will be, trigonal pyramidal not tetrahedral.
(d)
In this Lewis dot structure, there are 2 bond pair and 1 lone pair on the central atom. The total number of electron pair is 3. So, the hybridization of the molecule will be, but the the third position will be occupied by one lone pair. Hence, the geometry will be, bent not linear.
The image is also shown below.