- Differential Equations. Please Help me!!!?

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Find integers x and y such that 57x+79y=17, and 400 I need to describe two ways I would measure moles in chemistry lab and identify any equipment I would use? 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 meant by anisotropic? 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?