Question 1
Balanced equation:
2 KHCO3 ====> K2CO3 +
H2O + CO2
Reaction type: decomposition
Mass of KHCO3 = 1.5 gm
Moles of KHCO3 = 1.5 gm / 100.115 gm/mol = 0.01498 Moles
Moles of K2CO3 produced = 0.0074913 Moles
Mass of K2CO3 produced = 0.0074913 Moles x 138.2055 g/mol = 1.0353 gm
The actual yield is 1.040 gm. Hence Theoretical yield is 100 %
Question 2
Balanced equation:
2 KHCO3 ===> K2CO3 +
H2CO3
Reaction type: decomposition
The loss of mass is 0.271 gm which is H2CO3.
Mass of H2CO3 = 0.271 gm
Moles of H2CO3 = 0.271g/ 62.02 g/mmol = 0.004369 Moles
Moles of KHCO3 reacted = 0.00873 Moles
Mass of KHCO3 presents = 0.00873 Moles x 100.115 g/mol = 0.8748 gm
Percentage of KHCO3 in the unknown mixture = 0.8748 gm x100% /1.750 gm = 49.988 %
49.988 % of KHCO3 is presents in unknown mixture.
Is this answer correct? Also, please help me with the 2nd question. 1. A 1.500-g sample of potassium hydrogen carbon...
SECTION T O POSTLABORATORY ASSIGNMENT 1. A 1.500-g sample of potassium hydrogen carbonate is decomposed by me vield of K CO. 1.040 g of potassium carbonate. Calculate the theoretical yield and percent yield of 2 bonate is decomposed by heating to produce 2 KHCO3(s) 4 K CO3(s) + H2O(g) + CO2(B) 2. A 1.750-g sample containing potassium hydrogen carbonate is decomposed by heating. If the mass loss is 0.271 g, what is the percentage of KHCO3 in the unknown mixture?...
NAME POSTLABORATORY ASSIGNMENT SECTION 8 sample of potassium hydrocarbonate is decomposed by heating potassium carbonate Caksulate the theoretical vield and percent yield of onate is decomposed by heating to produce 2 KHCO3(-) K 00,6) + H2O) + coce) 2 A 1175 sample mixture of potassium hydropen carbonate is decomposed by heating of the malo is 0.275 g. what is the percentage of KHCO, in the unknown mixture 2 KHCO - KC0,0) + HCO3(e)
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