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velikii [3]
3 years ago
14

The mass numbers for two isotopes are unequal because they have different numbers of ______ .

Chemistry
1 answer:
DanielleElmas [232]3 years ago
4 0
They have different number of neutrons.
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1.05 x 10 to the 21 power formula units of lead (IV) phosphate
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How many yards are in 2.28 meters
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Enter your answer in the provided box.S(rhombic) + O2(g) → SO2(g) ΔHo rxn= −296.06 kJ/molS(monoclinic) + O2(g) → SO2(g) ΔHo rxn=
IgorC [24]

Answer: \Delta H^0=+0.3kJ/mol.

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

S_{rhombic}+O_2(g)\rightarrow SO_2(g)    \Delta H^0_1=-296.06kJ   (1)

S_{monoclinic}+O_2(g)\rightarrow SO_2(g)/tex] [tex]\Delta H^0_2=-296.36kJ  (2)

The final reaction is:  

S_{rhombic}\rightarrow S_{monoclinic}  \Delta H^0_3=?   (3)

By subtracting (1) and (2)

\Delta H^0_3=\Delta H^0_1-\Delta H^0_2=-296.06kJ-(-296.36kJ)=0.3kJ

Hence the enthalpy change for the transformation S(rhombic) → S(monoclinic) is 0.3kJ

3 0
3 years ago
A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. what is the partial pressure of oxygen
pentagon [3]
Pressure of the Mixture = 101.4 kpa  
Pressure of the helium phe = 82.5 kpa 
 Pressure of CO2 pco2 = 0.4 kpa.
 Partial pressure of oxygen = Pressure of the Mixutre - (Pressure of the
helium + Pressure of CO2)
 Partial pressure of oxygen = 101.4 - 82.5 - 0.4
 Partial pressure of oxygen = 18.5 kPa
7 0
3 years ago
Read 2 more answers
How can a solid dissolved in water be separated from the water?.
Alex73 [517]

Answer:

Evaporation

Explanation:

Boiling the water will make it evaporate, leaving the solid at the bottom of the solution

3 0
3 years ago
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