- Which is more important form specification or size specification?

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I need to describe two ways I would measure moles in chemistry lab and identify any equipment I would use? 6g of Mg in 16g of O2 are burnt. Calculate mass of MgO formed.? If you started with 3.60g of Copper and reacted it with an excess of nitric acid what mass of copper hydroxide would you expect to recover? What is the difference between an african kente hat and a kuli kofia koofi hat? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)?