Answer:
The molecular formula is the actual amount of atoms that make up a molecule
Explanation:
Avogadro’s number is 6.02 x 10^ 23 atoms (or molecules) per
mole. Through units cancellation:
Number of atoms = (4.56 mol)( 6.02 x 10^23 molecules/ mol) =
2.74 x 10^ 24 molecules
Since the C:H ratio is 1:4, 1 molecule of CH4 will have 4
atoms of hydrogen,
Therefore number of H
= 4 (2.74 x 10^24 molecules) = 1.098 x 10^ 25 atoms
Answer:
a. absorbs energy as heat and has positive enthalpy of solution.
Explanation:
A reaction can either be exothermic or endothermic. An endothermic reaction, as the dissolution described in the question, is that which absorbs heat energy from the surroundings in order to start the reaction.
Because an endothermic reaction makes heat lost from the surroundings, the enthalpy (∆H) of the solution will be positive (+). ∆H is got by finding the difference between the enthalpy of the reactants and products and since the enthalpy of a product in endothermic reaction is more, the enthalpy change (∆T) will be positive.
Answer:
when it reduces heat.
Explanation:
Thermal energy is transferred to material,the motion of its particles speeds up and it's temperature differences.Insulating materials are bad conductors and so this reduces the heat loss by conduction.The material also prevents air circulating inside the cavity,therefore reducing heat loss by convection.Heat loss through the roof can be reduced by laying loft insulation.
