A gas consist of 70% propane and 30% butane by volume. Find the stoichiometric air-to-fuel ratio.  a. 3:14 b. 14: 3 c. 23:1 d. 1:23

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Chapter1: Chemical Foundations
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1. A gas consist of 70% propane and 30% butane by volume. Find the stoichiometric air-to-fuel ratio. 
a. 3:14
b. 14: 3
c. 23:1
d. 1:23
 
2. A furnace is fired with fuel oil with a partial analysis of 7.6% S and 2.8% N. Orsat analysis of the stack gas shows 9.44% CO2, 1.19% CO, 0.4% SO2, 0.47% H2, 6.8% O2 and 81.7% N2. Air supplied is at 23 deg Celsius, 755 mmHg and 85% RH. Calculate the percent excess air.
a. 55%
b. 78%
c. 23%
d. 38%
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