Agas contains, by mass, 75% propane (c3h8, molar mass 44 09 g/mol), 20% n-butane (c. h1o, molar mass 58 12 g/mol), and the balance water (molar mass 18 02 g/mol) 41 calculate the molar composition of this gas on both a wet and a dry basis and the ratio (mol h2o/mol dry gas) (10) 4 2 if 100 kg/h of this gas is to be burned with 30% excess air, what is the required air feed rate (kmol/h)? (12) 4.3 how would the answer change of the combustion were only 80% complete?

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size