Lab 1 - Moles, Mass, and Volume

Thus if you counted 25 kernels in 30 seconds you

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Unformatted text preview: ed as 60 s/min or 1 min/60 s. Thus, if you counted 25 kernels in 30 seconds, you could count 50 kernels in a minute. (2) 1 min × 60 s min × 25 kernels 30 s = 50 kernels The unit "s" appears in the numerator of one term of equation 2 1 min × 60 s min × 25 kernels 30 s = 50 kernels , and in the denominator of another term. Algebraically, s/s = 1, just like a numerical value. The units cancel and do not appear in the result. Although the example above shows a conversion between two units of time, conversion factors between units of different types are also useful. Molar mass, in g/mol, is such a unit. For example, suppose you had 5.0 g of water. How many moles of water is that? (3) 5.00 g H2O × 1.00 mol H2O 18.0 g H2O www.webassig n.net/ebooks/wsug encheml1/lab_1/manual.html 2/5 4/15/13 Lab 1 - M oles, M ass, and Volume = 0.278 mol H2O In Equation 3 5.00 g H2O × 1.00 mol H2O 18.0 g H2O = 0.278 mol H2O , g H2O appears in the numerator and denominator and cancels. This may seem cumbersome, but it is a useful way to kee...
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