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There are three definitions (equalities) of mole. They are: 1 mole = 6.02 x 1023 particles. 1 mole = molar mass (could be atomic mass from periodic table or molecular mass) 1 mole = 22.4 L of a gas at STP (You do not need to worry about this yet) Each definition can be written as a set of two conversion factors.
Mole Calculation Practice Worksheet Answer the following questions: 1) How many moles are in 25.0 grams of water? 2) How many grams are in 4.500 moles of Li 2O? 3) How many molecules are in 23.0 moles of oxygen? 4) How many moles are in 3.4 x 10 23 molecules of H 2SO 4? 5) How many molecules are in 25.0 grams of NH 3?
= mass / moles = 54 / 3 = 18 g mol–1 3b. It could be water (H 2 O) 4. M r of CuCO 3 = 108 g mol–1 Moles of CuCO 3 = mass / M r = 9.0 / 124 = 0.073 mol M r of CuCO 3 = 63.5 + 12.0 + (3 x 16.0) = 123.5 = 124 (to 3 sf) 5a. Mass of Br 2 = density x volume = 3.1 x 2.0 = 6.2 g 5b. M r of Br 2 = 160 g mol–1 Moles of Br 2 = mass / M r = 6.2 / 160 ...
Mole Calculation Practice Worksheet. Answer the following questions: 1) How many moles are in 25 grams of water? 2) How many grams are in 4.5 moles of Li2O? 3) How many molecules are in 23 moles of oxygen? 4) How many moles are in 3.4 x 1023 molecules of H2SO4? 5) How many molecules are in 25 grams of NH3?
A mole is a quantity of matter that we use for conversion purposes. We can convert from grams to moles, liters to moles (for gases), and atoms or molecules to moles.
10) Copy the chart: 11) If you are converting between particles and moles, use __________________________ as conversion factor. 12) If you are converting between moles and grams, you need to know the ____________ of the compound.
1 Recall how to use simple mole calculations to calculate masses, moles, or relative. formula masses. 2 Practice rearranging equations. 3 Develop confidence in decoding complex word problems. Introduction. Mole calculations are an important tool for many kinds of people working in the sciences.
