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Clanicisa
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Chemistry


1. Write the chemical equation for the formation of CH3OH.
2.Write the chemical equation for the decomposition of caffeine, C4H5N2O.
3.Write the chemical equation for the complete combustion of liquid C6H14. Include phase symbols in your answer.
4.If a chemist has 1.87 moles of Na2O and causes it to decompose into its constituent elements, how many moles of Na will form?
5.A chemist has one mole of an unknown molecule. The mass of this sample is 184.1 grams. After doing some tests, the chemist determines that the molecule has 2 bromine atoms in it and one other atom she cannot identify. In other words, the molecule's formula is XBr2, where X is unknown. Based on the mass of the sample, what is atom X? For partial credit, explain how you reached your answer.
6. The oxidation of sodium into sodium oxide is described below:
4Na (s) + O2 (g) → 2Na2O (s)
If a chemist begins with 52.3 grams of oxygen (O2), how many grams of Na2O will be produced?
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