PPT-7.5 Molar Mass and Calculations

The molar mass of an element is useful to convert moles of an element to grams or grams to moles For example 1 mole of sodium has a mass of 2299 grams Learning Goal Calculate the molar mass of a . CALCULATION OF THE WATER OF HYDRATION COEFFICIENT. FROM YOUR DATA, FIND . MASS OF ANHYDROUS SALT. . ( SUBTRACT EMPTY BEAKER FROM BEAKER CONTAINNING THE ANHYDRATE AT END OF LAB).. CALCULATE THE MOLAR MASS (GFM) OF YOUR ANHYDROUS SALT AND CONVERT YOUR MASS TO MOLES.. Calculate the following percentage by mass:. percent = portion/total x 100. If two samples are the same substance, they should have the . same percent composition by mass.. A compound will have the same physical and chemical characteristics.. …. handouts on door. binders. 2. Begin the Do Now . . Track Your Progress on QUIZ . LTs. . handout . (15 min. ). . The Mole and Molar Mass!. What do the following all have in common?. What doesn’t belong?. Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?. Background: atomic masses. Look at the “atomic masses” on the periodic table. What do these represent?. The Mole. mole. (mol)- SI Unit for the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12.. A unit of counting, like the dozen.. Avogadro’s Number. CHAPTER 7-2. How to find the molar mass of an element. The . molar mass . of any substance is the mass (in grams) of one mole of the substance.. It is expressed as grams/mole (. g/. mol. ).. The molar mass of . Molar Mass. Molar mass- same as atomic mass but for a compound rather than an atom.. To determine the molar mass of any compound you add up the atomic mass of all atoms present.. NaCl. 22.99 35.45 = . THE MOLE. Mole. -The . number of C atoms in exactly 12.0 g of carbon., also a number 6.022 x 10. 23. Avogadro’s number . 6.022 x 10. 23. , the number of . particles. in a mole of . anything. More on the mole later……. Atomic Mass. What is an elements atomic mass?. The weighted average of its naturally occurring isotopes. .. When looking at an element on the periodic table of elements, where is atomic mass found?. Usually the top left hand corner of each elements box. However, on the periodic table that you will use for your AP Exam(s), this number will be located below each elements chemical symbol.. CALCULATION OF THE WATER OF HYDRATION COEFFICIENT. FROM YOUR DATA, FIND . MASS OF ANHYDROUS SALT. . ( SUBTRACT EMPTY BEAKER FROM BEAKER CONTAINNING THE ANHYDRATE AT END OF LAB).. CALCULATE THE MOLAR MASS (GFM) OF YOUR ANHYDROUS SALT AND CONVERT YOUR MASS TO MOLES.. 12.00 g C-12 = 1 mol The number of particles in 1 mole isatoms 1 mol6.022 binders. 2. Begin the Do Now . . Track Your Progress on QUIZ . LTs. . handout . (15 min. ). . The Mole and Molar Mass!. What do the following all have in common?. What doesn’t belong?. Dozen. Couple. Number of moles = . Mass (g. ). . . Mr (gmol. -1. ). What is the mass of 4 mol of . NaCl. ?. How many moles is 37g of Ca(OH). 2. ?. What is the mass of 0.125mol of . CuO. First lesson of our next unit: U7 Stoichiometry . P3 Challenge – . Determine the number and kinds atoms for the chemical formula Al. 2. (SO. 4. ). 3. Today’s Objective –. Moles and particles. Assignment: .