6. Under suitable conditions, thiourea, CS(NH2)2, is oxidized to sulfate by solutions of potassium bromate: 3CS(NH2)2 + 4BrO +3H2O → 3C0(NH2)2 + 35042 + 4Br + 6H+ A 0.0725 g sample of a material was found to consume 14.20 ml of 0.008340 M KBRO3. What was the percent purity of the thiourea (76.12 g/mol) in the sample? [ 9.33 ; 37.52 3.126 12.43 ] %

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6. Under suitable conditions, thiourea, CS(NH2)2, is oxidized to sulfate by solutions of potassium bromate:
3CS(NH2)2 + 4BrO3 + 3H20 → 3C0(NH2)2 + 3502 + 4Br + 6H+
A 0.0725 g sample of a material was found to consume 14.20 mL of 0.008340 M KBrO3. What was the percent purity
of the thiourea (76.12 g/mol) in the sample?
[ 9.33
37.52
3.126 ;
12.43 ] %
7. The tetraethyl lead, Pb(C2H5)4 in a 25.00 mL sample of gasoline was shaken with 15.00 mL of 0.02095 M I2. The
reaction is Pb(C2HS)4 + I2 Pb(C2HS)3I + C2HŞI
After the reaction was complete, the unused I2 was titrated with 6.09 mL of 0.03465 M NazS2O3.
I2 + 2NA2S203 → 2Nal + NazS4Os
Calculate the weight in milligrams of Pb(C2HS)4 (323.4 g/mol) in each milliliter of the gasoline.
[ 8.100; 5.400
2.700 ;
10.80
]mg/mL
Transcribed Image Text:6. Under suitable conditions, thiourea, CS(NH2)2, is oxidized to sulfate by solutions of potassium bromate: 3CS(NH2)2 + 4BrO3 + 3H20 → 3C0(NH2)2 + 3502 + 4Br + 6H+ A 0.0725 g sample of a material was found to consume 14.20 mL of 0.008340 M KBrO3. What was the percent purity of the thiourea (76.12 g/mol) in the sample? [ 9.33 37.52 3.126 ; 12.43 ] % 7. The tetraethyl lead, Pb(C2H5)4 in a 25.00 mL sample of gasoline was shaken with 15.00 mL of 0.02095 M I2. The reaction is Pb(C2HS)4 + I2 Pb(C2HS)3I + C2HŞI After the reaction was complete, the unused I2 was titrated with 6.09 mL of 0.03465 M NazS2O3. I2 + 2NA2S203 → 2Nal + NazS4Os Calculate the weight in milligrams of Pb(C2HS)4 (323.4 g/mol) in each milliliter of the gasoline. [ 8.100; 5.400 2.700 ; 10.80 ]mg/mL
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