Answer: i) -444.0 KJ/mol.
ii) -8880 KJ/mol.
iii) -1660.56 KJ/mol.
Explanation:
- To solve this problem, we should mention the reported value of burning one mole of propane (ΔH°combustion = -2220 KJ/mol).
C₃H₈ + O₂ → 3CO₂ + 4H₂O
i) The energy released from burning 0.2 mol:
Using cross multiplication:
1.0 mol → -2220 KJ/mol
0.2 mol → ??? KJ/mol
The energy released = (-2220 KJ/mol x 0.2 mol) / (1.0 mol) = -444.0 KJ/mol.
ii) The energy released from burning 4.0 mol:
Using cross multiplication:
1.0 mol → -2220 KJ/mol
4.0 mol → ??? KJ/mol
The energy released = (-2220 KJ/mol x 4.0 mol) / (1.0 mol) = -8880 KJ/mol.
iii) The energy released from burning 33.0 g of propane:
Firstly, we should convert the number of grams to moles.
n = mass/molar mass = (33.0) / (44.1 mol/g) = 0.748 mol.
Using cross multiplication:
1.0 mol → -2220 KJ/mol
0.748 mol → ??? KJ/mol
The energy released = (-2220 KJ/mol x 0.748 mol) / (1.0 mol) = -1660.56 KJ/mol.
Atoms of the same elements differing in the number of neutrons in their nuclei are known as isotopes. Thus, isotopes of an element have the same atomic number but different atomic mass number. Isotopes of an element have similar chemical properties but different physical properties.
C
Ionic crystals are made from ions that are bonded together by ionic bonds. An example is salt crystals that are made of sodium and chloride ions.
Explanation:
An ionic bond is formed when one atom donates electrons to another atom so they both attain stable electron configuration. The two atoms are then bound by their acquired charges. For example sodium atom2.8.1) donates its valence electrons to chlorine atom (2.8.7). They both achieve stable electron configuration of 2.8 and 2.8,8 respectively. Because sodium ion will now have a positive charge (because it has more protons than electrons) and chloride ion will have a negative charge because it has more electrons than protons, the two are bonded together electrostatically forming ionic bonds.
Learn More:
For more on ionic bonds check out;
brainly.com/question/957239
brainly.com/question/2234173
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Answer:
B
because the proton is positively charged and like charges repel, the neutron doesn't have a charge so nothing happens to it
Wait you wrote the answer in the question??
