Chapter 2, Problem 2.49E

The Cullinan diamond was the largest natural diamond ever found (January 25, 1905). It weighed 3104 carats (1 carat = 200 mg). How many carbon atoms were present in the stone?

If one can find the ratio of the number of moles of the elements in a compound to one another, one can find the formula of the compound. In a certain compound of copper and oxygen, CuxOy, we find that a sample weighing 0.9573g contains 0.7649gCu. a. How many moles of Cu are there in the sample? (MolesofCu=massofCumolarmassofCu) _moles b. How many gram of O are there in the sample? The mass of the sample equals the mass of the Cu plus the mass of O. _g c. How many moles of O are there in the sample. _moles d. What is the mole ratio (molesofCu/molesofO) in the sample? _:1 e. What is the formula of the oxide? The atom ratio equals the mole ratio and is expressed using the smallest integers possible. _ f. What is the molar mass of the copper oxide? _g/mol

Calculate the percent by mass of the element listed first in the formulas for each of the following compounds. l type="a"> copper(II) bromide, CuBr2 i>copper(I) bromide, CuBr i>iron(II) chloride, FeCl2 i>iron(III) chloride, FeCl3 i>cobalt(II) iodide, Col2 i>cobalt(III) iodide, CoI3 i>tin(II) oxide, SnO i>tin(IV)oxide, SnO2

The organophosphate nerve agent A-234 is believed to have the formula C5H8F2NO3P. It is one of the lethal chemical compounds known as Novichok agents which poisoned former Russian intelligence officer Sergei Skripal and his daughter Yulia on March 4, 2018 in Salisbury, England. How many fluorine atoms are in 100. micrograms of A-234? (Note: This amount is likely a lethal dose.)

How many total atoms are present in the following compound? (Please answer using whole numbers.) F8(Si2Br8)2

Martha sees a vile in her chemistry lab with the label C6H5O7. Her professor tells her it is citrate, a polyatomic ion with a -3 charge. She takes 1 mole of it and adds 3 moles of H to it. Her professor then tells her it tastes nicely sour. Martha knows she created citric acid. What is it's the chemical formula?

Conver Define Calcula One mole of a compound has the mass that is equal to the molecular mass.True O False jtm

1. A mole refers to the amount of substance which can be an atom, molecule, ion and other particle or group of particles. Which of the following DOES NOT relate to the concept of mole? deck of cards gallons of water bundle of sticks piece of paper

Element X forms three different compounds with element Y. Information about these compounds is contained in the table. Compound Formula Mass of Y per gram of X 1 XY6 2.82 g 2 XY? 1.41 g 3 XY? 0.94 g What are the formulas of compounds 2 and 3? Replace each question mark with the appropriate integer.