- What is 4:2 simplified?

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I need to describe two ways I would measure moles in chemistry lab and identify any equipment I would use? What the number degre of high acid? Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I? A 25.0mL solution containing .60M HCl was titrated with 0.50M NaOH. Calculate the pH before the titration and at equivalence point? Naphthalene sublimation rate=3*10^-5/min. Volume of room=60m^3. How would I calculate the naphthalene concentration in the air of the room?