A novel compound with a molar mass of 674.7 g/mol was isolated from bacterial cells. This compound was shown to be 53.4% C, 5.70% H, 12.5% N, and 28.5% O. What is the molecular formula of the compound? Relative atomic masses: H = 1.008; C= 12.011; N = 14.007; 0 = 15.999 The molecular formula of this compound is: IN 10 (Enter 1 if the corresponding subscript is 1)

1. Phosphoric acid is a colorless, syrupy liquid used in detergents, fertilizers and carbonated beverages. What is the molecular weight for this compound. (Use the atomic masses from the description.) H-1.008 amu; P = 30.97 amu; 0 - 16.00 amu A. 90.97 g/mol B. 79.99 g/mol C. 97.99 g/mol D. 99.97 g/mol 2. Using the molecular weight from the previous question, what is the percentage by mass of oxygen in phosphoric acid? A. 16.32% B. 65.31% C. 32.16% D. 56.31% 3. Do the percentages of hydrogen, oxygen and phosphorus add to a 100%? A. Yes B. No

5.) Ethylene glycol is a coolant widely used in automobiles. If its molecular formula is C2H6O2, how many moles would be present if you had 2500 g of this in your vehicle? A) 1.6 x 105 mol B) 2.5 x 10-2 mol C) 62 mol D) 40. mol

A scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed to be XBr, where X is the unknown metal. The scientist determined that a 4.720 g sample of this compound contains 4.745 x 10-2 mol Br. Calculate the atomic mass of the unknown metal, X. atomic mass = amu What is the identity of the metal? Provide the name or symbol of the element. metal: