The heat capacity of an object is given by the following equation: C equals 14000 straight J over straight K plus open parentheses 200 straight J over straight K squared close parentheses T plus open parentheses 3 straight J over straight K cubed close parentheses T squared What is the change in the entropy of the object (in J/K) associated with raising its temperature from 290 K to 380 K?

Select all that apply. when the products of a reaction have less energy than the reactants: the reaction is exothermic. the reaction is endothermic. the reactants lost internal energy. the change in enthalpy is positive.

Yasmin's teacher asks her to make a supersaturated saline solution. her teacher tells her that the solubility of the salt is 360 g/l at room temperature (25 °c). how can yasmin make a supersaturated saline solution? she can add 380 g of salt to 1 l of hot water (75 °c) and stir until all the salt dissolves. then, she can carefully cool the solution to room temperature (25 °c). she can add 360 g of salt to 1 l of room temperature water (25 °c) and stir the solution until all the salt dissolves. she can add 380 g of salt to 1 l of cold water (5 °c) and stir the solution until most of the salt dissolves. then, she can carefully heat the solution to room temperature (25 °c). she can add 380 g of salt to 1 l of room temperature water (25 °c) and let the solution sit for 24 hours, so the salt dissolves.

Aballoon is floating around outside your window. the temperature outside is -5 ∘c , and the air pressure is 0.700 atm . your neighbor, who released the balloon, tells you that he filled it with 4.80 moles of gas. what is the volume of gas inside this balloon?