Which scenario is Hess' law not used for? to determine if a reaction is endothermic or exothermic
to calculate the amount of heat lost by a sample of metal in a calorimeter
to determine the energy involved in an equation when the energy cannot be directly measured
to determine the amount of heat gained or lost in a reaction

Astudent states that 9.0 g of baking soda will form an unsaturated solution in 100 g of water. what do you need to know to decide whether this statement is correct? a. the temperature of the water and the molar mass of baking soda b. the percent by volume of the solution and the solubility of baking soda c. the temperature of the water and the solubility of baking soda at that temperature

Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8×10^-5

Convert a speed of 201 cm/s to units of inches per minute. also, show the unit analysis by dragging components into the unit‑factor slots.