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Umnica [9.8K]
2 years ago
11

Give the nuclear symbol (isotope symbol) for the isotope of bromine that contains 44 neutrons per atom. nuclear symbol:_________

_ Give the nuclear symbol (isotope symbol) for the isotope of iron that contains 30 neutrons per atom. nuclear symbol:__________ Give the nuclear symbol (isotope symbol) for the isotope of gold that contains 118 neutrons per atom. nuclear symbol:__________
Chemistry
1 answer:
Savatey [412]2 years ago
4 0

Answer:79

35Br

56

26Fe

197

79Au

Explanation:

In the nuclear symbol of an element, the superscript represents the mass number. The mass number is the sum of the number of protons and the number of neutrons present in the atom. The subscript is the atomic number which is the number of protons present in the atom or the number of electrons in the neutral atom.

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4190.22 L = 4.19 m³.

Explanation:

  • For the balanced reaction:

<em>2P₂ + 5O₂ ⇄ 2P₂O₅. </em>

It is clear that 2 mol of P₂ react with <em>5 mol of O₂ </em>to produce <em>2 mol of P₂O₅.</em>

  • Firstly, we need to calculate the no. of moles of 6.92 kilograms of P₂O₅ produced through the reaction:

no. of moles of P₂O₅ = mass/molar mass = (6920 g)/(283.88 g/mol) = 24.38 mol.

  • Now, we can find the no. of moles of O₂ is needed to produce the proposed amount of P₂O₅:

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??? mol of O₂ is needed to produce → 24.38 mol of P₂O₅.

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  • Finally, we can get the volume of oxygen using the general law of ideal gas:<em> PV = nRT.</em>

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T is the temperature of the gas in K (396.90°C + 273 = 669.9 K).

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