(b) Using 25.0 cm of aqueous sodium hydroxide, 2.24 mol / dm'3, 3.86 g of crystals were obtained. Calculate the percentage yield.
2NaOH + H2SO—>Na2SO4 + 2H2O
Na2SO4 + 10H20—>Na S04.10H2O
I
Number of moles of NaOH used =
Maximum number of moles of Na2S04.10H2O that could be formed =
Mass of one mole of Na2S04.10H20 = 322g
Maximum yield of sodium sulphate-10-water =
Percentage yield =

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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