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3 years ago

The hybird orbitals used for bonding by xe in unstable xef2 molecules

1 answer:

5 0

<span>hybrid orbitals are
sp3d

how - in XeF2 there are 3 lone pairs and 2 bond pairs so hybridization is 3+ 2 = 5 so 5 orbitals are needed therefore s p p p d are five orbitals in order </span>

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How many days does it take 16.Og of Gold-198 to decay to 1.0g? (each half-

forsale [732]

Answer:

10.8 days (3 sig.figs.)

Explanation:

All radioactive decay is 1st order decay defined by the expression A = A₀e^-kt

which is solved for time of decay (t) => t = ln(A/A₀) / -k

A = final weight = 1.0 gram

A₀ = initial weight = 16.0 grams

k = rate constant = 0.693/t(1/2) = 0.693/2.69 days = 0.258 days⁻¹

t = ln(1/16) / -0.258da⁻¹ = (-2.77/-0.258) days = 10.74646792 days (calculator)

≅ 10 days (1 sig. fig. based on given 1 gram mass)

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2 years ago

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raketka [301]

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3 years ago

A chemist measures the energy change ?H during the following reaction:

Leno4ka [110]

Answer:

(A) endothermic

(A) Yes, absorbed

Explanation:

Let's consider the following thermochemical equation.

2 Fe₂O₃(s) ⇒ 4 FeO(s) + O₂(g) ΔH = 560 kJ

Since ΔH > 0, the reaction is endothermic.

We can establish the following relations:

560 kJ are absorbed when 2 moles of Fe₂O₃ react.
The molar mass of Fe₂O₃ is 160 g/mol.

Suppose 66.6 g of Fe₂O₃ react. The heat absorbed is:

$66.6g.\frac{1mol}{160g} .\frac{560kJ}{2mol} =117kJ$

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3 years ago

2 Points

Ganezh [65]

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3 years ago

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k0ka [10]

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3 years ago