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JulsSmile [24]
3 years ago
13

Bromine is the only nonmetal that is a liquid at room temperature. consider the isotope bromine-81, . select the combination whi

ch lists the correct atomic number, number of neutrons, and mass number, respectively.
Chemistry
1 answer:
s344n2d4d5 [400]3 years ago
5 0
<span>Answer:
atomic number=35
number of neutrons=46
mass number=81
</span>

The number that written on isotopes is showing the mass number of the molecule, so Bromine-81 mass number is 81. The <span>atomic number of bromine(look at the periodic table) should be 35 which means it has 35 protons. The number of neutron should be: mass-proton= 81-35= 46.</span>
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You have to put your attention to the unit of concentration. It is expressed in terms of molarity, which is represented in M. It is the number of moles solute per liter solution. So, you simply have to multiply the molarity with the volume in liters.

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How many grams of magnesium acetate are in 8.95x10^23 formula units?
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Answer:

211.63 g.

Explanation:

  • Particles could refer to atoms, molecules, formula units.
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<em><u>Using cross multiplication:  </u></em>

1.0 mole → 6.022 x 10²³ molecules.

??? mole → 8.95 x 10²³ molecules.

  • The no. of moles of magnesium acetate = (8.95 x 10²³ molecules) (1.0 mole) / (6.022 x 10²³ molecules) = 1.486 mol.

∴ The grams of magnesium acetate are in 8.95 x 10²³ formula units = n x molar mass = (1.486 mol)(142.394 g/mol) = 211.63 g.

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