Determine the empirical formula for a compound that contains C, H and O. It contains 52.14%C, 13.13 %H and 34.73%O by mass.

Which atoms are listed in order of increasing size (smallest to largest)?

What is the correct answer to the following expression:  (49.1 – 42.61) x 13.1?

How many phosphorus atoms are contained in 1580 g of phosphorus, P?

 How many Br atoms are in 2.50 g of Br? 

What is the net ionic equation for the reaction below?                    AgNO3(aq)  +  KBr(aq)  →  AgBr(s)  +  KNO3(aq)

Calculate the percent composition by mass of oxygen in Na2CO3. 

JJ is a 73-year-old male with acute myelogenous leukemia. He attends the infusion clinic where he receives chemotherapy treatment.  Following his chemotherapy treatment this time he experiences a significant rise in his serum uric acid to 22 mg/dL (this is high). Which of the following is true regarding the best management of his tumor lysis syndrome (TLS)?

LO is a 39yo M receiving his chemotherapy on the oncology unit at the hospital.  The nurse calls you to tell you that the patient has had a fever of 103.4°F for the last 4 hours.  You quickly recognize the patient should be started on antibiotics and contact the MD.  Prior to initiating therapy, the oncologist orders the following labs, cultures, and tests.  CMP- normal,  ANC =100 PE:  Unremarkable, except PICC line insertion site is erythematous, swollen, warm, and there is pus present Microbiology:  Blood Cx x 2, pending Wound culture (PICC insertion site):   G+ cocci in clusters Urine Culture:  no growth to date Urinalysis:   leukocyte esterase (-), Squamous epithelial cells (-), WBC (-) Chest x-ray:  no infiltrates or effusions Patient is currently on Cefepime monotherapy Based on the information you have above, you decide to modify the patient’s therapy.  Which of the following is the best answer? 

TB is a 19-year-old healthy female seeking oral contraception (OC).  She has no history of thromboembolism, cerebrovascular disease or cancer.  After completing an appropriate and normal physical exam with her primary care provider, you recommend she begin the following type of contraceptive therapy: