By using the following reactions, calculate the heat of formation of pentane (c5h12) gas from carbon and hydrogen gas. c (s) + o2 (g) co2 (g), h = 395 kj/mol h2 (g) + 1/2o2 (g) h2o (l), h = 285 kj/mol c5h12 (g) + 8o2 5co2 (g) + 6h2o (l), h = 3.54 × 103 kj/mol

This line graph compares the growth of plants that were kept in the sun for different amounts of time.a)  on day 7, the plants kept in the sun for 3 hours were how tall? b)  on day 7, the plants kept in the sun for 6 hours were how tall? c)    on day 10, the plants kept in the sun for 9 hours were how tall? d)  on day 11, the plant that was grown with 1 hour of sunlight was how tall? e)  based on the graph, the plant grows best in what amount of sunlight?

You have 125g of a certain seasoning and are told that it contains 76.0 g of salt what is the percentage of salt by mass in this seasoning

Asolution contains 180 g of glucose (c6h12o6) and 162 g of water. what is the mole fraction of glucose?