To minimize instrumental errors, the absorbance should fall within the range: (a) 0.8-0.9 absorbance unit (b) 0.8-0.2 absorbance unit (c) 0.2- 0.9 absorbance unit (d) the range must be experimentally determined (e) all of the above

What shape would a molecule with two bound groups and two lone pairs have?

What volume would 2.25 moles of ne has occupy at stp?

Reacting masses1 calcium carbonate breaks down on heating to produce calcium oxide and carbondioxide gas.caco3 + cao + co2a student heats 15 g of calcium carbonate strongly in a crucible.relative atomic masses (a): ca = 40, c = 12, o = 16.calculate the mass of calcium oxide produced by this reaction.(5 marks)