Answer:
Zinc helps your immune system
Explanation:
Answer: 138 J/K
Explanation:
1) ΔS reaction = ΔS products - ΔS reactants
2) ΔS products = 2ΔS Fe(s) + 3 ΔS H₂O (g)
3) ΔS reactants = ΔS Fe₂O₃ (s) + 3 ΔS H₂ (g)
4) Now you have to search the standard entropy values for each product and each reactant in a table.
I found these values at 25° and 1 bar.
ΔS H₂O = 188.8 J/Kₓmol
ΔS Fe(s) = 27.3 J/Kmol
ΔS Fe₂O₃ (s) = 87.4 J/Kmol
ΔS H₂ (g) = 130.7 J/Kmol
5) Replace those values into above equations:
ΔS products = 2ΔS Fe(s) + 3ΔS H₂O (g) =
2 mol × 27.3 J/K×mol + 3 mol ×188.8 J/K×mol = 621.0 J/K
ΔS reactants = ΔS Fe₂O₃ (s) + 3 ΔS H₂ (g) =
1mol × 87.4 J/K×mol + 3×130.7 J/K×mol = 479.5 J/K
ΔS reaction = 621.0 J/K - 479.5 J/K = 141.5 J/K
Taking into account the differences in the values from different sources (specially due to the temperature), you can consider that the value 141.5 J/K is pretty much close to 138 J/K, and take that answer.
Answer:
Explanation:
To convert from grams to moles we must use the molar mass, which is found on the Periodic Table.
Use the molar mass as a ratio.
Multiply by the given number of grams: 118
Flip the fraction so the grams of argon will cancel each other out.
The original measurement of grams had 3 significant figures, so our answer must have 3 sig figs.
For the number we calculated, that is the hundredth place. The 7 in the thousandth place tells us to round the 5 to a 6.
There are about <u>2.96 moles of Argon</u> in 118 grams.
Answer:
The answer to your question is : 16.9 g of Ag
Explanation:
Data
26 g Ag
10.8 g of Sn
2.4g Cu
0.8 Zn
Ag = ? in 26 g of sample
Total mass in the amalgam = 26 + 10.8 + 2.4 + 0,8 = 40 g
Rule of three
40 g of sample -------------- 26 g of silver
26 g of sample -------------- x
x = (26 x 26) / 40
x = 16.9 g of Silver