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BARSIC [14]
3 years ago
7

Write the isotope notation for terbium-165.

Chemistry
2 answers:
lozanna [386]3 years ago
5 0

Answer:

The isotope notation for terbium-165 = _{65}^{165}\textrm{X}

Explanation:

The isotopic representation of an atom is: _Z^A\textrm{X}

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

We have, isotope terbium-165

65 = Atomic number of the terbium atom

165 = Mass number of the terbium atom

Tb = Symbol of the terbium atom

The isotope notation for terbium-165 = _{65}^{165}\textrm{X}

Artyom0805 [142]3 years ago
4 0

Naturally occurring terbium (65Tb) is composed of 1 stable isotope, 159Tb.

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A sample of sugar (C12H22O11) contains
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4 moles of sugar.

Explanation:

A mole is defined as the amount of a substance contained in Avogadro's number of particles 6.02 x 10²³.

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Given that;

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3 years ago
Why do atoms emit light energy according to the bohr model?
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Explanation:

3 0
2 years ago
Calculate the average reaction rate expressed in moles h2 consumed per liter per second
djyliett [7]

Answer:

Average rate of reaction expressed in moles H₂ consumed per liter per second = 0.0025 M/s = 0.0025 mol/L.s

Explanation:

The complete, correct Question, is presented in the attached image to this answer.

The average rate of reaction in terms of the reactant is defined as the total amount of reactant consumed over a period of time divided by total period of time.

Mathematically,

Average rate of reaction = (change in concentration of H₂ over a period of time) ÷ (total period of time)

Average rate of reaction = (-ΔC)/(Δt)

The minus sign is there because the concentration of reactants reduce with time.

change in concentration of H₂ = -ΔC

= -(0.02 - 0.03) = 0.01 M

Time = Δt = 4 - 0 = 4.0 s

Average rate of reaction = (0.01/4) = 0.0025 M/s

We could solve for the average rate of reaction expressed in moles Cl₂ consumed per liter per second

change in concentration of Cl₂ = -ΔC

= -(0.04 - 0.05) = 0.01 M

Time = Δt = 4 - 0 = 4.0 s

Average rate of reaction = (0.01/4) = 0.0025 M/s = 0.0025 mol/L.s

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3 years ago
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