The half-life for the first-order decomposition of a is 355 s. how much time must elapse for the concentration of a to decrease to a. one-fourth

Find the mass in grams of 1.37x1020 particles of h3po4

  the mississippians were considered to be  horticulturalists, which means they were

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign