3 years ago

1. What is uncertainty in measurements?

1 answer:

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Answer:

In metrology, measurement uncertainty is the expression of the statistical dispersion of the values attributed to a measured quantity.By international agreement, this uncertainty has a probabilistic basis and reflects incomplete knowledge of the quantity value. It is a non-negative parameter.

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The standard enthalpy of formation of Ca2+ (g) (∆H = 1934 kJ/mol)

Alex73 [517]

Answer:

see explanation

Explanation:

The process of ionization to produce cations is endothermic. For formation of Ca⁺² two ionization steps need be illustrated as follows...

1st ionization step: Ca° + 590Kj => Ca⁺ + e⁻

2nd ionization step: Ca⁺ + 1151Kj => Ca⁺² + e⁻

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Net Ionization Rxn: Ca° + 1741Kj => Ca⁺² + 2e⁻