28) How many moles contain 6.022 × 1023 lithium atoms? A) 2 moles B) 1 mole C) 6.022 x 1023 moles 29) How many moles of iron(II) sulfate are contained in 4 .657 g FeSO, ? B) 0.03066 C) 0.4657 A) 1.245 D) 151.9 30) How many moles contain 1.022 x 1023 copper atoms? A) 0.1697 mol B) 1.697 mol C) 0.01697 mol

28) How many moles contain 6.022 × 1023 lithium atoms? A) 2 moles B) 1 mole C) 6.022 x 1023 moles 29) How many moles of iron(II) sulfate are contained in 4 .657 g FeSO, ? B) 0.03066 C) 0.4657 A) 1.245 D) 151.9 30) How many moles contain 1.022 x 1023 copper atoms? A) 0.1697 mol B) 1.697 mol C) 0.01697 mol

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter3: Molecules, Moles, And Chemical Equations

Section: Chapter Questions

Problem 3.79PAE: 3.79 Consider two samples. Sample A contains 2 moles of N2 and 1 mole of O2, and Sample B contains 1...

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You have a 20.0-g sample of silver metal. You are given 10.0 g of another metal and told that tills sample contains twice the number of atoms as the sample of silver metal. Is this possible?
3.79 Consider two samples. Sample A contains 2 moles of N2 and 1 mole of O2, and Sample B contains 1 mole of N2O5. (a) Which sample contains more molecules? (b) Which sample contains more oxygen atoms? (c) Which sample contains more nitrogen atoms?
Use the average atomic masses given inside the front cover ofthis book to calculate the mass in grams of each of the following samples. l type='a'> 0.00552 mole of calcium 6.25 mmol of boron (1mmol=11000mole) i>135 moles of aluminum 1.34107 moles of barium 2.79 moles of phosphorus 0.0000997 mole of arsenic
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A binary compound of magnesium and nitrogen is analyzed, and 1.2791 g of the compound ¡s found to contain 0.9240 g of magnesium. When a second sample of this compound is treated with water and heated, the nitrogen is driven off as ammonia, leaving a compound that contains 60.31% magnesium and 39.69% oxygen by mass. Calculate the empirical formulas of the two magnesium compounds.
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