Question

You are given an unknown containing KClO3. Following the procedure in your manual, you obtain the following fictional data Note! For this problem use the given (allbeit incorrect) vapor pressure of water

Mass of empty test tube 71.8394 g

Mass of test tube + unknown 72.1363 g

Mass of test tube + unknown + MnO2 72.3077 g

Mass of erlenmeyer flask with residual water 323.06 g

Mass of erlenmeyer flask filled with water 358.52 g

Atmospheric pressure 760.9 mmHg

Temperature of water 38.0 °C

Partial pressure of water at 38.0 34.36 mmHg

Mass of test tube + Residue after heating 72.2370 g

Density of water .996 g/mL

Calculate: A) Molar volume of Oxygen

(a) Volume of Oxygen collected _______________ mL

(b) Partial pressure of dry oxygen _______________ mmHg

(c) Volume of oxygen corrected to STP _______________ mL

(d) Mass of oxygen produced _______________ g

(e) Moles of oxygen gas produced _______________ mol

(f) Calculated molar volume at STP _______________ L/mol

B) Per cent KClO3 in unknown

(g) Mass of unknown used _______________ g

(h) Moles of KClO3 calculated from moles O2 _______________ mol

(i) Mass of KClO3 in unknown calculated from moles O2 _______________ g

(j) Per cent KClO3 in unknown _______________ %

C) Residual "KCl??" from UNKNOWN Residual "KCl??" is what is left in the tube after heating except for the MnO2

(k) Mass of residual KCl? produced from UNKNOWN _______________ g

(l) Theoretical yield of KCl if UNKNOWN is 100% KClO3 _______________ g

(m) % Yield of "KCl" based on k and l above _______________ % 2) Look up in the handbook or elsewhere.... the actual vapor pressure of water at 38 °C _______________ mmHg WARNING...Do not use this number in problem 1

Answer 1

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