c.diamonds are the hardest
Answer:
76.1 grams.
Explanation:
- From the balanced reaction:
<em>2AlCl₃ + 3Br₂ → 2AlBr₃ + 3Cl₂,</em>
<em></em>
2.0 moles of AlCl₃ reacts with 3.0 moles of Br₂ to produce 2.0 moles of AlBr₃ and 3.0 moles of Cl₂.
- We need to calculate the no. of moles of (42.3 g) of AlCl₃:
<em>no. of moles of AlCl₃ = mass/molar mass =</em> (42.3 g)/(133.34 g/mol) = <em>0.3172 mol.</em>
<em></em>
<u><em>Using cross multiplication:</em></u>
2.0 moles of AlCl₃ react completely with → 3.0 moles of Br₂.
0.3172 mol of AlCl₃ react completely with → ??? moles of Br₂.
∴ The no. of moles of Br₂ = (0.3172 mol)(3.0 mol)/(2.0 mol) = 0.4759 mol.
<em>∴ The amount of grams of Br₂ are required to react completely with 42.3 grams of AlCl₃ = (no. of moles of Br₂)(molar mass) </em>= (0.4759 mol)(159.81 g/mol) = <em>76.05 g ≅ 76.1 g.</em>
This is most likely "-100 kj/mol, spontaneous," but the question is difficult to read
No because anything can freeze but the warmer it is the longer it will take to be fully frozen. If you want the substance to freeze faster have it be cold by putting it in the fridge or something.
