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1 answer:
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Answer:
A- Nucleus
B-Energy levels
Explanation:
- An atom refers to the smallest particle of an element that can take part in a chemical reaction.
- An atom is made up of two major parts namely; the nucleus and the energy shell or energy levels.
- The nucleus of an atom contains the sub atomic particles, protons and neutrons while the energy shells contain the sub atomic particle electrons.
- It is important to note that the protons in the nucleus are positively charged which makes the nucleus to be positively charged.
- On the other hand, energy shells are negatively charged because of the negative charge of the electrons.
4 mol / 205g H2O = 4/.205 = 19.5 mol/kg boiling point = 100 + 19.5 • 0.51 = 109 ºC
We call it a solid because it has the () and in s inside of it meaning solid
Answer:
ΔH°rxn = -47 kJ
Explanation:
Using Hess´s law for the reaction:
3 Fe2O3(s) + CO(g) → 2 Fe3O4(s) + CO2(g) ,
the ΔH°rxn will be given by the expression:
ΔH°rxn kJ = 2ΔHºf(Fe3O4) + ΔHºf(CO2) - ( 3ΔHºf(Fe2O3) + ΔHºf(CO) )
= 2(-1118) + (-394) - ( 3( -824 ) + ( -111 ) )
= - 47 kJ
Volume ⇒ 50 mL in liters : 50 / 1000 = 0.05 L
Molarity of solution ⇒ 0.15 M
Number of moles:
n = M * V
n = 0.15 * 0.05
n = 0.0075 moles of CuCl2
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