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Which of the following reactions is double replacement?

A scuba tank has a volume of 10.0 L and contains 50.0 g of O₂ gas at 25 °C. What is the pressure inside the tank? (R = 0.0821 L·atm/mol·K; M(O₂) = 32.0 g/mol)

Which functional group is present in acetaldehyde (CH₃CHO)?

How many grams of NaCl are produced when 100.0 mL of 1.00 M HCl completely neutralizes NaOH? (Reaction: HCl + NaOH → NaCl + H₂O; Molar mass NaCl = 58.44 g/mol)

A 5.00 g sample of an unknown gas occupies 2.50 L at 0.850 atm and 300 K. What is its molar mass? (R = 0.0821 L·atm·mol⁻¹·K⁻¹)

Which of the following pairs have the same electronic configuration?

For In producing methanol: CO + 2H₂ → CH₃OH, starting with 3.00 mol CO and 5.00 mol H₂, the theoretical moles of CH₃OH formed are:

In the Lewis structure of CH₄, the central carbon atom has how many bonding pairs?

The suffix “-ene” in organic nomenclature indicates: