Answer:
ΔH=483 kJ
Explanation:
Its given that
For the reaction A+2B→C+3D has ΔH = 161 kJ.
As the ΔH is positive this is an endothermic reaction where we supply energy.
It is given that we supposed to find ΔH for the following equation.
3A+6B→3C+9D ΔH=?
So we observe that
3*(A+2B)→3*(C+3D)
So the whole reaction is rised with a coefficient of 3 hence the ΔH would be three times the original one.
ΔH=3*161 kJ
ΔH=483 kJ
The enthalpy change (ΔH) for the reaction 3A+6B→3C+9D is three times the original ΔH, given that the original reaction A+2B→C+3D has a ΔH of 161 kJ. Thus, ΔH for the related reaction is 483 kJ.
The reaction given: A+2B→C+3D, has an enthalpy change (ΔH) of 161 kJ per stoichiometric coefficient of the reaction. Therefore, when you multiply the reaction by three to give 3A+6B→3C+9D, the ΔH value will also be multiplied by three. Thus, the ΔH for the reaction 3A+6B→3C+9D is 161 kJ x 3, which is equal to 483 kJ.
This is because ΔH for a reaction is directly proportional to the number of moles or the quantity of reactants and products involved as shown by Hess's law. For instance, if you have twice or three times the quantity of reactants, you would release or absorb twice or three times that amount of energy, respectively.
Moreover, the enthalpy change of a reaction can also be determined by the enthalpies of formation of the reactants and products or the bond energies depending on the details available. But in this case, the information given directly allows for a simple multiplication to find the answer.
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value is equal to the accepted value?
136 g/mol
154 g/mol
164 g/mol
172 g/mol
172 is correct
Answer:
Option d = 172 g/mol
Explanation:
Formula mass of [CaSO₄.2H₂O]
Formula mass = 40.078 + 32.065 + 4×16 + 4 + 16×2
Formula mass = 40.078 + 32.065 + 64 + 4 + 32
Formula mass = 172.143 g/mol
so, 172 g/mol is the correct answer.
The formula mass of compound calcium sulfate dihydrate is 172 g/mole.
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
The formula mass of compound = 40+32+16×4+4+32=172 g/mole.
Learn more about compound,here:
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Usually within an atom, the protons and electrons are equal to make the atom have a neutral charge.
However, there are cases in which the protons and electrons are different, such as Cations and Anions. Cations end up having a positive charge (less electrons than protons), and Anions end up having a negative charge (more electrons than protons).
I hope this helps!
Answer:
Yes
Explanation:
If an object is flat and it falls it will go against the air (Air-Resistance) when falling down, which it will make the block go slower then a sphere which has no sides and will fall faster then the square or Block because there isn't a flat side it wont go against the air ( Air-Resistance).