Recent activity by ValeriaMetca

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Calculate the standard enthalpy change for the vaporization of 1 mole of water at 100°C, given that the enthalpy of fusion of water is 6.01 kJ/mol and the enthalpy of vaporization of water is 40.7 kJ/mol.

asked 1 day ago in Chemical thermodynamics

1 answer 31 views

Calculate the standard enthalpy change for the fusion reaction of solid sodium chloride (NaCl) at 25°C, given the following information: ΔHf°[NaCl(s)] = -411 kJ/molΔHf°[Na(s)] = 108 kJ/molΔHf°[Cl2(g)] = 0 kJ/mol The balanced chemical equation for the fusion reaction of NaCl is:NaCl(s) → Na(s) + 1/2Cl2(g)

asked 2 days ago in Chemical thermodynamics

1 answer 5 views

Assuming you have a mixture of ethanol and water, design a distillation column that can achieve a 95% purity of ethanol in the distillate using the minimum number of plates possible. The feed to the column contains 40% ethanol and 60% water, and the distillate and bottoms products need to be at least 95% pure. The column operates at atmospheric pressure and the feed rate is 100 kg/hr. Also, determine the reflux ratio required to achieve this separation.

answered Jan 22 in Chemical engineering

1 answer 28 views

A battery consists of a Zinc electrode and a Copper electrode. Calculate the exchange current density at the Zinc electrode if the concentration of Zinc ion in its solution is 0.1 M and the potential difference between the electrodes is 1.5 V. The standard electrode potential for Zinc is -0.76 V and the transfer coefficient for the electrode reaction is 0.5.

answered Jan 22 in ElectroChemistry

1 answer 39 views

According to Pavlov's classical conditioning, how can we shape an individual's behaviour?

answered Jan 20 in Psychology

1 answer 51 views

Who introduced the 'Realistic Conflict Theory'?

answered Jan 15 in Psychology

1 answer 5 views

What is the importance of context in qualitative research?

answered Jan 14 in Psychology

1 answer 18 views

What is the role of government in mental health?

answered Jan 14 in Psychology

1 answer 20 views

What is the main criticism of CBT?

asked Jan 13 in Psychology

1 answer 18 views

Which system consists of all the bones of the body?

asked Jan 8 in Science

1 answer 51 views

The sun’s heat can also be trapped in your home by using south facing windows and good what?

answered Jan 2 in Science

1 answer 10 views

Fish use some of their fins to propel themselves through the water and others to do what?

answered Dec 30, 2024 in Science

1 answer 27 views

According to rutherford, where is the vast majority of the mass of an atom located?

asked Dec 30, 2024 in Science

1 answer 27 views

Incomplete dominance and epistasis are both terms that define what?

asked Dec 27, 2024 in Science

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