Recent activity by DaisyZ884821

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Calculate the standard enthalpy of formation of carbon dioxide from its elements under standard conditions given the following information:- The standard enthalpy of combustion of carbon to CO2 is -393.5 kJ/mol- The standard enthalpy of combustion of hydrogen to H2O is -285.8 kJ/mol- The standard enthalpy of formation of water is -241.8 kJ/mol.Note: The standard enthalpy of formation of an element in its standard state is zero.

asked 2 days ago in ThermoChemistry

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How can the concentration of lead in a given water sample be determined using atomic absorption spectroscopy?

answered Jan 29 in Analytical Chemistry

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What is the molecular formula and the name of the alkane that has seven carbon atoms and forms a straight chain?

asked Jan 21 in Organic Chemistry

1 answer 23 views

When might older adults experience 'ego integrity'?

answered Jan 17 in Psychology

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What is the operant model of pain?

asked Jan 16 in Psychology

1 answer 21 views

What is a cross-sectional study?

answered Jan 14 in Psychology

1 answer 48 views

What is the role of environmental factors in anxiety?

answered Jan 14 in Psychology

1 answer 24 views

What is the name of the thin layer that acts as a boundary between the stratosphere and the mesosphere?

answered Jan 7 in Science

1 answer 7 views

What is the clear, protective covering on the outside of the eye?

answered Jan 6 in Science

1 answer 25 views

The amount of force applied per given area is called?

asked Dec 31, 2024 in Science

1 answer 20 views

Gymnosperms have seeds but do not have what?

asked Dec 30, 2024 in Science

1 answer 25 views

As a polycrystalline material solidifies, grains with irregular shapes form. the interfaces between grains constitute grain what?

asked Dec 30, 2024 in Science

1 answer 44 views

Many adolescents experience frequent mood swings. name one of the causes for this.

asked Dec 28, 2024 in Science

1 answer 19 views

The proximity of the axillary buds to the apical bud is partly responsible for their what?

asked Dec 27, 2024 in Science

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