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Gelneren [198K]
2 years ago
6

An Expert, please answer this question!

Chemistry
2 answers:
IRINA_888 [86]2 years ago
8 0

Answer:

C

Explanation:

Rudiy272 years ago
3 0

Answer:

C) The student and desk have to be in contact to apply the force.

Explanation:

I am pretty sure :)

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Calculate the average molar bond enthalpy of the carbon-hydrogen bond in a ch4 molecule.
balandron [24]
<span>The average molar bond enthalpy of the carbon-hydrogen bond in a CH4 molecule is 416 KJ/mol. (+716.7 + (4 x 218) - (- 74.6) ) / 4 = + 1663.3 / 4 = 416</span>
7 0
2 years ago
Read 2 more answers
Which of the following is a type of physical change.
trapecia [35]

Answer:

B. a change in their state or substance

Explanation:

A change of state consists of a physical process in which the structure of the substance changes, its appearance. EXAMPLE: in the merger, the solid state becomes liquid, changes the rearrangement of particles from being highly compacted to being less compact.

6 0
3 years ago
What is the electron configuration for the Co3+ ion?
liq [111]

Answer:

1s2 2s2 2p6 3s2 3p6 3d4 4s2

Explanation:

Cobalt has twenty seven electrons hence Co3+ has twenty four electrons. It has lost three electrons from its valence shell. In filling the orbitals, we keep in mind that the energy of the 4s level is higher than that of the 3s level when a transition metal forms a complex hence the 4s is filled before the 3s level as shown in the answer above.

6 0
3 years ago
a gas that exerts a pressure of _____ bar in a container with a volume of 0.5650 L will exert a pressure of 715.1 bar when trans
vampirchik [111]
Boyle's law gives the relationship between pressure and volume of gases.
it states that for a fixed amount of gas at constant temperature, pressure of gas is inversely proportional to volume.
PV = k
where P - pressure , V - volume and k - constant 
P1V1 = P2V2 
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
substituting this equation 
P x 0.5650 L = 715.1 bar x 1.204 L
P = 1 524 bar

8 0
3 years ago
Explain how energy is conserved between this reaction and the and surrounding environment C3H8+4O2-&gt;3CO2+4H2O+ heat (-2218.6)
alukav5142 [94]

Answer:

The heat of formation = Heat of formation of the products - Heat of formation of the reactants

= -2323 + 104 = -2219 ≈ -2218.6 kJ/mol.

Explanation:

The law of conservation of energy states that the total energy is constant in any process. Energy may change in form or be transferred from one system to another, but the total remains the same

The heat of formation of C₃H₈ is 3C + 4 H₂ → C₃H₈ \Delta H^{\circ}_f  -104 kJ/mol

The heat of formation of O₂ is O₂ (g) → O₂ (g)  \Delta H^{\circ}_f  0 kJ/mol

The heat of formation of H₂O is H₂(g) + 1/2 O₂→ H₂O (g)  \Delta H^{\circ}_f  -286kJ/mol

The heat of formation of CO₂ is C (s) + O₂ (g) → CO₂ (g)  \Delta H^{\circ}_f  -393 kJ/mol

Therefore, in the given  reaction we have;

C₃H₈ + 4 O₂ → 3 CO₂ + 4 H₂O

The heat of formation = Heat of formation of the products - Heat of formation of the reactants

The heat of formation = 3 × (-393) + 4 × (-286) - (-104) = -2219 ≈ -2218.6 kJ/mol.

5 0
3 years ago
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