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3 years ago

Identify the atom whose nucleus is composed of 56 protons and 82 neutrons

1 answer:

3 0

An atom is the smallest particle of an element that can take part in a chemical reaction. Its structure has a nucleus and energy levels. The nucleus of an atom contain protons and neutrons whereas the energy levels contain electrons.
For a particle containing 56 protons (atomic number) and 82 neutrons has 56 electrons since the number of protons and neutrons in an uncharged atom are equal.
The atom in this case is must be an isotope of Barium since barium has an atomic number of 56 .

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Answer:

1. C (deposition)

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Determine the approximate amount of potassium hydrogen phthalate, KHP, that you will need to neutralize 6.00 ml of 0.100 M NaOH.

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Answer:

potassium hydrogen phthalate KHP MOLAR MASS = 204.233 glmol

to get 1000 ml

Molar concentration = Mass concentration/Molar Mass

mass concentration = molar concentration x molar mass

mass concentration=0.1 M,

molar mass= 204.233 g/mol

so to get 1L

mass conc = 204.233 x 0.1

= 20.4233g for 1L or 1000 ml

to get 6.00 ml

if 20.4233g is for 1000ml

then to 6.00 ml

= 20.4233 x 6 / 1000

= 0.123g for 6.00 ml

according to the equation below

NaOH(aq) + KHC8H4O4(aq) --> KNaC8H4O4(aq) + H2O(l)

number of moles of NaOH is equal to that of KHP

so the same amount will be needed too, which is

= 0.123g

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3 years ago

Answer these questions based on 234.04360 as the atomic mass of thorium-234. The masses for the subatomic particles are given. R

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How many neutrons does Thorium-234 have? 144

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