Answer:
Formula in Hill system is I2O8. Computing molar mass (molar weight). To calculate molar mass of a chemical compound enter its formula and click 'Compute'. In chemical formula you may use: Any chemical element.
Explanation:
Answer: The change in enthalpy will be -13.
Explanation:-
Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.
for Endothermic reaction is positive and for Exothermic reaction is negative.
When 1 mole of A combining with 1 mole of B to produce 3 moles of C
Thus as the stoichiometry has got half of the original , enthalpy of the reaction will also get half.
Thus for reaction :
Thus the change in enthalpy will be -13.
The balanced reaction would be:
2CO + O2 = 2CO2
We assume that the gases are ideal gas so that we use the relation that 1 mol of an ideal gas is equal to 22.4 L of the gas at STP. From that relation, we get the number of moles and we can convert it to other units. We do as follows:
1.0 L CO ( 1 mol / 22.4 L ) ( 2 mol CO2 / 2mol CO ) = 0.045 mol CO2 produced
0.045 mol CO2 ( 22.4 L / 1 mol ) = 1 L of CO2
0.045 mol CO2 ( 44.01 g / 1 mol ) = 1.98 g of CO2
Answer:
D
Explanation:
Seeing the Lewis formula for each of the molecules, we can attempt to write the condensed structural formula for each.
What we notice is that while there are purely single bonds between the carbon atoms in the first molecule, there is a double bond in the second molecule and a triple bond in the third
What we can deduce from this is that these are alkanes , alkenes and alkynes
The alkynes have the strongest of the three bonds and thus they have the strongest bonds in the mix
Since molecule 3 is an alkyne, then we can say that it has the strongest of the bonds
Heat given out to the surroundings by the system = 225 J
Work done by the system on the surroundings = 645 J
According to the energy conservation, the energy can neither be created nor it can be destroyed, it can transform from one form to another. Hence, the energy which is lost to the surrounding as a work done and heat came from the internal energy of the system.
Hence, the change in the internal energy = - 225 - 645 = - 870 Joules
Negative sign means that the internal energy of the system is decreased by 870 Joules
