*URGENT* Your barbecue grill uses propane (C3Hg) to cook your food while butane (C4H10) is used in chemistry laboratories to perform experiments. Write an equation for hydrocarbon combustion for each of the gases and then balance.

Are these reactions endothermic or exothermic? How do you know?

Assume that the gases burn clean and completely, calculate the energy released by each in kJ/mole.

Calculate the energy released in kJ/g. Which gas is more efficient?

Be sure to show all of your work!

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

Effect of rotenone and antimycin a on electron transfer rotenone, a toxic natural product from plants, strongly inhibits nadh dehydrogenase of insect and fish mitochondria. antimycin a, a toxic antibiotic, strongly inhibits the oxidation of ubiquinol. (a) explain why rotenone ingestion is lethal to some insect and fish species. (b) explain why antimycin a is a poison. (c) given that rotenone and antimycin a are equally effective in blocking their respective sites in the electron-transfer chain, which would be a more potent poison? explain.

If 15 drops of ethanol from a medical dropper weight 0.60g, how many drops does it takes from a dropper to dispense 1.0ml of ethanol? the density of ethanol is 0.80g/ml