Answer:
How many atoms are in 6.2 moles of aluminum? I mol = 6.02X1023 atoms so 6.2 mol = 6.2x (6.02x1025) = 3.73 x1024 atoms of Aluminum
1. alizarin yellow R, color change at pH 10-12
2. thymol blue, color change at pH 2-4
3. methyl red, color change at pH 3-5
4. phenolphthalein, color change at pH 8-10
<span>5. bromothymol blue, color change at pH 6-8
These are the list of indicators that we have to choose from them and the correct answer will be 5) Bromothymol blue, due to color change at pH 6-8
Due to both HI is strong acid and Ba(OH)</span>₂ is strong base so the formed salt BaI₂ will has pH = 7 and the equivalence point will be 7 so it will be in the effective range of Bromothymol blue
Answer:
(b) Tincture of iodine is made by dissolving iodine in alcohol
A chemical reaction
has an increase in entropy and a decrease in enthalpy. The chemical reaction is
spontaneous. A chemical reaction is spontaneous if it has an entropy greater
than zero and an enthalpy less than 0