Questions by OnaKee41409

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1 answer 39 views

Calculate the heat of formation (∆Hf) of water (H2O) given the following reactions and their respective heats of reaction (∆Hr):2H2(g) + O2(g) → 2H2O(g); ∆Hr = -484 kJ/mol ½ O2(g) + H2(g) → H2O(l); ∆Hr = -285.8 kJ/mol Note: The heat of formation is the amount of heat released or absorbed when one mole of a compound is formed from its elements in their standard states.

asked Jan 23 in Chemical bonding

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1 answer 45 views

Calculate the corrosion rate of iron (Fe) in a galvanic couple with copper (Cu), given that the area of the iron electrode is 8 cm² and the current density is 0.6 mA/cm². The standard electrode potential of iron is -0.44 V and that of copper is +0.34 V.

asked Jan 23 in ElectroChemistry

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1 answer 6 views

A sample of nitrogen dioxide is placed in a container at 250°C and 1 atm, where it decomposes according to the following equation: 2NO2(g) ↔ 2NO(g) + O2(g)The initial concentration of NO2 is 0.10 M, and the equilibrium constant (Kc) at this temperature is 4.0 x 10^-3. If the volume of the container is suddenly decreased to one-half of its original volume, causing the pressure to double, what will happen to the amount of NO and O2 present at equilibrium? Calculate the new equilibrium concentrations of NO and O2.

asked Jan 22 in Chemical equilibrium

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1 answer 18 views

Who proposed the cognitive-affective personality system?

asked Jan 20 in Psychology

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1 answer 4 views

According to the cognitive-behavioural model, what is the role of behaviour in depression?

asked Jan 17 in Psychology

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1 answer 28 views

What is inter-rater reliability?

asked Jan 16 in Psychology

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1 answer 49 views

What are academic journal articles?

asked Jan 10 in Psychology

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1 answer 24 views

One gram of proteins provides how many calories of energy?

asked Dec 31, 2024 in Science

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1 answer 9 views

In species with sexual reproduction, each cell of the body has two copies of each what?

asked Dec 31, 2024 in Science

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