Write the symbolic notation of an isotope of an element having 8 protons, 8 electrons, and 9 neutrons

1 answer:

7 0

The number of protons uniquely identifies the element. This is not on the periodic table. Isotopic notationincludes the atomic number and the mass number. 8 17 This isotope of oxygen has 8 protons (atomic number), 8 electrons and 9 neutrons

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3 years ago

How many grams of steam at 100 °C would be required to raise the temperature

Alex777 [14]

The mass of steam required to raise the temperature of water is 3.5 g.

The given parameters;

mass of the benzene, = 47.6
initial temperature of the benzene, = 5.5 ⁰C
final temperature of the benzene = 30 ⁰C

The molar mass of Benzene = 78.11 g/mol

The molar mass of water = 18 g/mol

The number of moles of the Benzene is calculated as follows;

$n = \frac{47.6}{78.11} = 0.61 \ mole$

The mass of steam required is calculated as follows;

heat lost by steam = heat absorbed by benzene

$\frac{m}{18} \times 40.7 \times 10^3 = 47.6(1.63)(30-5.5) \ + \ 0.61 \times 9.87 \times 10^3\\\\2261.11 m = 7921.61\\\\m = \frac{7921.61}{2261.11} \\\\m = 3.5 \ g$