So I believe you are supposed to take notes based on the guiding questions (the questions on the side).
<span>0.38
You first calculate the total moles by dividing the grams by molecular weight:
45 g N2 / 28.02 g/mol = 1.6 mol N2
40 g Ar / 39.95 g/mol = 1.0 mol
Then you divide the moles of Ar by the total number of moles:
1.0 / (1.6 + 1.0) = 0.38 mol fraction</span>
Answer:
3.47 mol MnSO4
Explanation:
54.94 + 32.07 + (16 × 4) = 151.01g/mol MnSO4
542.32g / 151.01g/mol = 3.47 mol MnSO4
Answer:
Option 5.
Equal amounts of hydroxide and hydronium ions
Explanation:
2H₂O ⇄ H₃O⁺ + OH⁻ Kw: 1×10⁻¹⁴
Neutral solution has pH = 7
So, [H₃O⁺] = [OH⁻]
In solutions of only pure water:
[H₃O⁺] = 1×10⁻⁷ M
[OH⁻] = 1×10⁻⁷ M
Kw = [H₃O⁺] . [OH⁻] → 1×10⁻⁷ . 1×10⁻⁷ = 1×10⁻¹⁴
