3 years ago

What is the mass number of an atom which is made up of 27 protons,33 neutrons and 27 electrons?

Chemistry

1 answer:

Gelneren [198K]3 years ago

7 0

27 is the mass number

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what are two ways the study of fossils helps add to our understanding of the changes in Earth's environments?

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4 years ago

80 liters of oxygen is collected over water at 50.0 degrees Celsius. The atmospheric pressure during the collection was 96.00 kp

vlabodo [156]

Answer:

The value of partial pressure of oxygen $P_{O_{2} }$ = 83.66 K pa

Explanation:

Volume of oxygen = 80 liters

Temperature = 50°c

The total pressure = 96 K pa

The partial pressure of water at 50°c is calculated from the tables.

$P_{H_{2}O }$ = 12.344 K pa

The total pressure is given by

$P_{total} =$ $P_{H_{2}O } + P_{O_{2} }$

Put all the values in the above equation we get

96 = 12.344 + $P_{O_{2} }$

$P_{O_{2} } =$ 96 - 12.344

$P_{O_{2} }$ = 83.66 K pa

This is the value of partial pressure of oxygen.

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4 years ago

Calculate the freezing point of a solution containing 15 grams of kcl and 1650.0 grams of water. the molal-freezing-point-depres

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Answer is: freezing point is -0,226°C.
Answer is: the molal concentration of glucose in this solution is 1,478 m.
m(KCl) = 15 g.
n(KCl) = m(KCl) ÷ M(KCl).
n(KCl) = 15 g ÷ 74,55 g/mol.
n(KCl) = 0,2 mol
m(H₂O) = 1650 g ÷ 1000 g/kg = 1,65 kg.
b = n(KCl) ÷ m(H₂O).
b = 0,2 mol ÷ 1,65 kg = 0,122 m.
Kf(water) = 1,86°C/m.
ΔT = Kf(water) · b(solution).
ΔT = 1,86°C/m · 0,122 m.
ΔT = 0,226°C.

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3 years ago

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How much significant figures does 147,320 have

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