(Answered) Need to know how to show work and correct significant

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Need to know how to show work and correct significant figures.

What Mass of H₂CO_{3 is needed to prepare 575mL of a 0.34M solution?}

What is the Molarity of a Ca(OH)₂solution that contains 36.0 grams of Ca(OH)₂IN 0.394L of solution?

What mass of MgBr₂ is needed to prepare 575mL of a 0.34M solution?

The concentration of Cholesterol C₂₇H₄₆O, In normal blood is approx 0.005M. How many grams of Cholesterol are in 750mL of blood?

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