Avogadro defined one mile of carbon-12 atoms to have a mass of exactly 12 grams. Calculate the number of oxygen gas molecules in 1 mole

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?

Akno3 solution containing 51 g of kno3 per 100.0 g of water is cooled from 40 ∘c to 0 ∘c. what will happen during cooling?