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2. Atoms & Elements

Mole Concept

2. Atoms & Elements

Mole Concept

Open Question
How many moles of magnesium, mg, contain 9.31 × 10²² atoms of magnesium?
Open Question
How many oxygen atoms are there in 1.25 g of sodium dichromate, Na₂Cr₂O₇?
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Multiple Choice
How many molecules are in 68.6 moles of CO₂?
Open Question
Write a conversion factor for the relationship between grams and a mole of fe.
Multiple Choice
How many moles are equivalent to 3.01 x 10^23 atoms of carbon?
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Multiple Choice
How many moles of oxygen atoms are present in one mole of CO_2?
Multiple Choice
How many moles of solute are present in 50.0 mL of 0.20 M KNO_3 solution?
Multiple Choice
How many hydrogen atoms are present in 35.0 grams of hydrogen gas (H_2)?
Multiple Choice
How many moles of K_2SO_4 are present in 15.0 g of K_2SO_4? (Molar mass of K_2SO_4 = 174 g/mol)
Multiple Choice
How many moles of atoms are present in 8.00 g of 13C?
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Multiple Choice
A solution is prepared by dissolving 3.35 mol of NaCl in enough water to make 1.00 kg of solution. What is the mole fraction of NaCl (solute) in the solution?
Multiple Choice
How many moles of chlorine atoms are present in 71.0 g of Cl\(_2\)?
Multiple Choice
In the balanced chemical equation for the complete combustion of butane (C_4H_{10}), what is the mole ratio of butane (C_4H_{10}) to carbon dioxide (CO_2)?
Multiple Choice
How many silicon atoms are present in 2 molecules of SiH_4?
Multiple Choice
You have 10.0 g each of Na, Mg, and Al. Which sample contains the greatest number of atoms?