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2. Atoms & Elements

Mole Concept

2. Atoms & Elements

Mole Concept

Multiple Choice
How many moles are present in 432 g of Ba(NO3)2?
Open Question
How many molecules of N₂O₄ are in 76.3 g N₂O₄? The molar mass of N₂O₄ is 92.02 g/mol.
Open Question
A 65-kg woman has 8.5 × 10⁻³ mol of hemoglobin in her blood. How many hemoglobin molecules are there in the woman's blood?
Multiple Choice
How many silicon atoms are present in 1.00 g of silicon (Si)? (Atomic mass of Si = 28.09 g/mol)
Multiple Choice
What is the total number of atoms contained in 2.00 moles of nickel (Ni)?
Multiple Choice
How many magnesium atoms are present in 1.00 mole of Mg?
Multiple Choice
In a sample of sucrose (C12H22O11) containing 1.0 x 10^20 atoms of carbon, how many oxygen atoms are present?
Multiple Choice
One mole of which of these compounds contains two moles of hydrogen atoms?
Multiple Choice
How many atoms are present in 12 grams (1 mole) of carbon-12?
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Open Question
How many atoms of phosphorus are in 2.5 moles of Cu₃(PO₄)₂
Multiple Choice
How many moles are present in 7.5 × 10^{19} molecules of ammonia (NH_3)?
Multiple Choice
How many molecules are present in 2.50 moles of O_2?
Multiple Choice
How do you calculate the number of moles of a diprotic acid if you have 0.1236 grams of it dissolved in 40 mL of water, given its molar mass is 61.04 g/mol?
Multiple Choice
How many moles of oxygen atoms are present in 25.45 g of CaCO₃?
Open Question
How many atoms are in 5.80 moles of He?