![]() ![]() For this case, lets say that that substance is Carbon (C). Let's say that you are given an amount of grams of a substance. Number of atoms are calculated using a number known as "Avogadro's number." ![]() How many atoms of zinc, Zn, are in #"120.71 g Zn"?# Once you have moles, multiply by Avogadro's number to calculate the number of atoms. So, if you are given the mass of an element, you use the periodic table to find its molar mass, and multiply the given mass by the reciprocal of the molar mass. To calculate atoms of Au, multiply moles Au by Avogadro's number. The final answer will be rounded to four significant figures. I'm keeping a couple of guard digits to reduce rounding errors. To calculate moles of Au, multiply the given mass by the reciprocal of the molar mass. This means that its molar mass is #"196.967 g/mol"#. The periodic table shows us that gold, Au, has the atomic weight How many atoms of gold are in #"58.27 g"# of gold? ![]() The following example will show you how to do that. There are two basic steps to get from the given mass to the number of atoms. Usually you will have a given mass of an element. One mole of anything, including atoms, is #6.022xx10^23# (Avogadro's number) of them. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |