Please help i dont have much time cause i have to give it in soon :,)
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Oxygen-16 is the atom in question.
- Atomic number: 8.
- Mass number: 16.
The superscript of the ion says "2-". That means that the ion here carries a charge of -2.
- The charge is negative, meaning that there are more electrons (which are negative) than protons (which are positive) in that ion.
- The size of the charge is 2. There are two more electrons than protons in that ion.
There are 10 electrons in total in that ion. There are two more electrons than protons. That means that there are 10 - 2 = 8 protons in that ion.
The atomic number of an atom is the same as its number of protons. The atomic number of X is 8.
The atomic number determines the element. Atomic number 8 is oxygen. Thus element X is oxygen.
Mass number is the sum of number of protons and neutrons in an atom. 8 + 8 = 16 for this atom.
Answer:
The formula of hydrocarbon =
Explanation:
% of C = 85.7
Molar mass of C = 12.0107 g/mol
% moles of C = 85.7 / 12.0107 = 7.14
% of H = 14.3
Molar mass of H = 1.00784 g/mol
% moles of H = 14.3 / 1.00784 = 14.19
Taking the simplest ratio for C and H as:
7.14 : 14.19 = 1 : 2
The empirical formula is =
Also, Given that:
Pressure = 508 Torr
Temperature = 17 °C
The conversion of T( °C) to T(K) is shown below:
T(K) = T( °C) + 273.15
So,
T = (17 + 273.15) K = 290.15 K
Volume = 1.500 L
Using ideal gas equation as:
where,
P is the pressure
V is the volume
n is the number of moles
T is the temperature
R is Gas constant having value = 62.3637 L.torr/K.mol
Applying the equation as:
508 Torr × 1.500 L = n × 62.3637 L.torr/K.mol × 290.15 K
⇒n = 0.0421 moles
Given that :
Amount = 1.77 g
Molar mass = ?
The formula for the calculation of moles is shown below:
Thus,
Molar mass of the hydrocarbon = 42.04 g/mol
Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.
Thus,
Molecular mass = n × Empirical mass
Where, n is any positive number from 1, 2, 3...
Mass from the Empirical formula = 1×12 + 2×1= 14 g/mol
Molar mass = 42.04 g/mol
So,
Molecular mass = n × Empirical mass
42.04 = n × 14
⇒ n = 3
<u>The formula of hydrocarbon = </u>