Chapter 7 Moles and Molar Mass exam with 100% Correct answers already graded A+

Avogadro's Number in honor of Amadeo Avogadro () The mole (mol) The unit for counting atoms. The mole is a unit for counting just as a dozen or a ream or a gross is used to count. Atomic mass for an element The average relative mass of all the isotopes for the element. 1 mole atoms = 1 mole molecules = The atomic mass of an element in grams contains (2) The atomic mass of an element in grams contains... (1) Avogadro's number of atoms (2) and is defined as the molar mass of that element. To determine molar mass we change the units of the atomic mass (found in the periodic table) from atomic mass units to grams. For example, sulfur has an atomic mass of 32.07 amu, so 1 mol of sulfur has a molar mass of 32.07 g and contains 6.022x10^23 atoms of sulfur. Here are some other examples: One mole of any element contains atomic mass expressed in grams is the ? of an element. atomic mass expressed in grams is the MOLAR MASS of an element. It is different for each element. 10 g of Chalk How many moles is 1.5 x 10^24 atoms? How many cu atoms are in 0.56 mole of copper? Mass of 1 mole (Avogadro's number) collection of any entity is known as its Molar Mass Avogadro Number is chosen so that molar mass of an element is numerically same as atomic mass in amu as given in the periodic table. Avogadro Number is chosen so that molar mass of an element is NUMERICALLY SAME AS ATOMIC MASS IN AMU as given in the periodic table. Molar mass of copper = 63.55 g/mole Molecular mass: Sum of atomic masses of atoms in amu as present in the chemical formula. Moles > g > number conversion 1. Make a solution map. 2. Use conversion factors using molar mass and avogadro's number. How many molecules of glucose (C6H12O6) are present in 50.0 g of glucose? STEP 1: Make a plan/solution map STEP 2: Write the equation with correct conversion factors for every step in the solution map. Formula unit One mole of a compound contains Avogadro's number of formula units of that compound. A formula unit is indicated by the fo