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Express your answers using the proper number of significant figures: c = 3.00 x 10⁸ m/s, h = 6.626 x 10⁻³⁴ Js, 1 Hz = s⁻¹, 1 J = 1 kg m²/s², 1 nm = 1 x 10⁻⁹ m.
Calculate the molar concentration of a 2.5 L solution containing 4.7 moles of HNO₃. A student dissolved 36.5 g of CaBra₂ in enough water to make 825 ml of solution.
What is the molar concentration of the solution?
What volume of a 1.9 M HBr must be used to make 100.0 mL of 0.50 M HBr solution?

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