A 12 yr old male with AML is hospitalized for intensificatio…

A 12 yr old male with AML is hospitalized for intensification of chemotherapy. He is started on Bactrim, acyclovir and fluconazole prophylaxis. He develops prolonged fevers >10 days with an increased oxygen requirement. CXR demonstrates low lung volumes. He is receiving Vancomycin and Zosyn and FARVPP is negative. What is the next BEST test to perform for diagnostics?

A reaction occurs in a closed container that releases 950 J…

A reaction occurs in a closed container that releases 950 J of heat into the surroundings. As the reaction proceeds, the product falls out as a solid and causes the container to contract. This results in the surroundings performing 220 J of work on the system. What is the change in internal energy (in kJ)?