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TiliK225 [7]
3 years ago
8

When given a compound, adding up all of the _______ of all of the individual atoms within one molecule of a compound will determ

ine the molecular mass.
Chemistry
2 answers:
andreev551 [17]3 years ago
7 0
The answer is adding up the protons of each individual atom will give you its atomic mass.
RSB [31]3 years ago
3 0

Answer is: atomic masses.

For example, calculate molecular mass of one mole of ethanol (C₂H₅OH). Molecule of ethanol has two carbon atoms, six hydrogen atoms and one oxygen atom:

M(C₂H₅OH) = 2Ar(C) + 6Ar(H) + Ar(O) · g/mol.

M(C₂H₅OH) = 2·12 + 6·1 + 16 · g/mol.

M(C₂H₅OH) = 46 g/mol; molar mass.

Atomic mass is approximately equivalent to the number of protons and neutrons in the atom.

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7 0
3 years ago
Enter your answer in the provided box. From the data below, calculate the total heat (in J) needed to convert 0.304 mol of gaseo
diamong [38]

Answer:

-35,281.5 J

Explanation:

To convert the gaseous ethanol to liquid ethanol, three steps will occur. First, it will lose heat and the temperature will decrease until its boiling point, so from 300.0°C to 78.5°C. Thus, more heat will be lost, but now, with the temperature constant, so the gas will be converted to liquid. And then, the liquid will lose heat to decrease the temperature from 78.5°C to 25.0°C.

The total heat loss is the sum of the heats of each step. Because the heat is being removed from the system, it's negative. The first and last step occurs with a change in temperature, and so the heat is calculated by:

Q = m*c*ΔT

Where m is the mass, c is the specific heat of the gas (first step) or liquid (last step), and ΔT the temperature variation (final - initial). The mass of ethanol is the molar mass 46.07 g/mol multiplied by the number of moles, so:

m = 46.07 * 0.304 = 14.00 g

The second step occurs without a change in temperature, and the heat is then:

Q = -n*ΔH°vap

Where n is the number of moles, ΔH°vap is the heat of vaporization, and the minus signal indicates that the heat is being lost. Then, the heat of each step is:

Q1 = 14.00*1.43*(78.5 - 300,0) = -4434.43 J

Q2 = -0.304*40.5 = -12.312 kJ = -12312 J

Q3 = 14.00*2.45*(25.0 - 78.5) = -1835.05 J

Q = Q1 + Q2 + Q3

Q = -35,281.5 J

5 0
3 years ago
How can you increase the momentum of an object?
Elena-2011 [213]
I think its B because if u increase the mass itll have more force which will increase the momentum
5 0
3 years ago
A block of has a length of 7cm, a width of 4cm, and a height of 10cm. Its mass measures 840g. What is it's density?
andriy [413]

Answer:

Explanation:

Density is

mass / volume = d

Mass:

840g

Volume:

7 cm x 4 cm  x 10 cm = 280 cm^3

840g / 280 cm^3 = 3 g/cm^3

3 0
2 years ago
Which half-reaction equation represents the
erica [24]
The reduction reaction is the gain of electrons while oxidation reaction is the loss of electrons. For potassium ion(K+), the reaction should be K+ + e- ==> K. So the answer is (1).
8 0
3 years ago
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