A 1.0-g sample of carbon dioxide (CO2) is fully decomposedinto its elements, yielding 0.273 g of carbon and 0.727 g ofoxygen. (a) What is the ratio of the mass of O to C? (b) If asample of a different compound decomposes into 0.429 g ofcarbon and 0.571 g of oxygen, what is its ratio of the mass ofO to C? (c) According to Dalton’s atomic theory, what is theempirical formula of the second compound?

A compound Y containing carbon, hydrogen and oxygen only have the following composition by mass:C: 40.0% ; H: 6.7% ; O: 53.3%(a) Calculate the empirical formula of the compound. (Relative atomic masses: H =1.0, C = 12.0, O = 16.0) (b) Given that the relative molecular mass of compound Y is 180. Find its molecular formula.

Which of the following is a molecular compound?  (a)NaCl (b) NaOH (c) FePO4 (d) LiF (e) H2O

12 of 3 What amount of CUSO4•5H,O, in moles, does this mass represent? mass = 1.787 g X mol resubmit Incorre The molar mass of CuSO4 5H,O is 249.69 g/mol.

Convert the composition of the following alloy from atom percent to weight percent (a) 44.9 at% of silver, (b) 46.3 at% of gold, and (c) 8.8 at% of copper. The atomic weights for silver, gold, and copper are 107.87, 196.97, and 63.55 g/mol, respectively.

The anticancer drug Platinol (Cisplatin), Pt(NH₃)₂Cl₂,reacts with the cancer cell’s DNA and interferes with its growth.(a) What is the mass % of platinum (Pt) in Platinol? (b) If Pt costs$19/g, how many grams of Platinol can be made for $1.00 million(assume that the cost of Pt determines the cost of the drug)?

Be sure to answer all parts. TCDD, also called dioxin (C H,Cl,O2, molar mass 322.0 g/mol), is a potent poison. The average lethal dose in humans is estimated to be 3.0 x 10- mg per kg of body weight. (a) How many grams constitute a lethal dose for a 91-kg individual? (b) How many molecules of TCDD does this correspond to? (a) X 10 g dioxin (b) x 10 molecules

Use the References to access important values if needed for this question. A binary compound of oxygen and an unknown element, X, has the formula X,0 and is 53.55 mass % oxygen. (a) What is the atomic weight of element X? u (b) What is the symbol for the element on the periodic table? X = (c) Is the element X a metal or not? (d) Is the compound X20 likely to be ionic or covalent? (e) What is the name of the compound? Submit Answer 5 question attempts remaining

What is the molecular weight of sugar, C6H12O6 in atomic mass units? And If you had one mole of sugar molecules, how much would it weigh?

If you have 2.00x10^12 atoms of an element and it weighs 3.94x10^-10g, answer the following questions:  (1) The molar mass of the element to one decimal place is what g/mol. (2) Based on your molar mass the chemical symbol for the element is ?