O 1.27 5. Which of the following hydrates has the highest formula weight as the

Question

O 1.27 5. Which of the following hydrates has the highest formula weight as the anhydrous salt? O cobalt chloride O cupric chloride O calcium chloride O magnesium chloride 6. The molecular mass of aluminum sulfate is 342 g/mol. You find through experimentation that the ratio of mass of dry salt to mass of hydrate is a ratio of close to 3/5 What is the percentage water by mass in the hydrate ? 20% o 40% ? 60% 80% 7. The molecular mass of anhydrous aluminum sulfate Is 342 g/mol. The precise ratio of mass of anhydrous salt to hydrate is 61%. What is the approximate mole ratio of water to salt for aluminum sulfate hydrate? ? 3:1 0 51 O 10:1 ? 12-1 8. The hydrates used in this lab all contain alkali metal salts O True ? False swers Graphs Units Precision Algebra Submit

Explanation / Answer

5) Cobalt(II) Chloride - 130 g/mol
    Cupric(II) Chloride - 134.45 g/mol
    Calcium Chloride - 110.98 g/mol
    Magnesium Chloride - 95.2 g/mol

6) The molecular mass of Aluminium sulphate = 342 g/mol
    Mass of anhydrate / Mass of Hydrate = 3/5
    Mass of Hydrate = Mass of anhydrate * 5/3 = 342 * 5/3 = 570 g/mol
    Difference in the mass = 570 g/mol - 342 g/mol = 228 g
    % of water by mass in hydrate = (228 / 570)*100 = 40%

7) Mass of anhydrate / Mass of Hydrate = 0.61
Mass of Hydrate = Mass of anhydrate / 0.61 = 342/0.61 = 560.65
Mass of water = 560.65 - 342 = 218.65
moles of water = 218.65 / 18 = 12.14
Ratio of moles of water to anhydrous salt = 12:1

8) Aluminium salt not an alkali metals, so the option is False

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.