Mole concept, stoichiometry, empirical and molecular formulas, concentration units.
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Q1 · Some Basic Concepts of Chemistry · MEDIUM
A compound contains 4.07% hydrogen, 24.27% carbon and 71.65% chlorine by mass. Its empirical formula is:
Q2 · Some Basic Concepts of Chemistry · EASY
Which of the following has the maximum number of molecules?
Q3 · Some Basic Concepts of Chemistry · HARD
In a reaction, 3.2 g of methane reacts with 12.8 g of oxygen to form CO₂ and H₂O. The limiting reagent is:
Q4 · Some Basic Concepts of Chemistry · EASY
What is the number of moles of oxygen atoms present in 88 g of CO₂?
Q5 · Some Basic Concepts of Chemistry · HARD
The density of a 3 M solution of NaCl is 1.25 g/mL. The molality of the solution is approximately: