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AS topic 1 calculations allsorts

Last updated 2 months ago

6 Nsɛmmisa

2

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1.

Calculate the atom economy for this process to make hydrogen peroxide.

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2

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2.

In a reaction, 2.00 kg of ammonium persulfate were reacted with an excess of water to produce 287 g of hydrogen peroxide. Calculate the percentage yield.

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3.

100 cm³ of hydrocarbon C_aH_b reacts with 1000 cm³ of oxygen, which is an excess, to form 300 cm³ of carbon dioxide with 550 cm³ of oxygen remaining. Assuming all gas volumes are measured at the same temperature and pressure, deduce the formula of the hydrocarbon

4

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4.

Calculate the relative molecular mass of this compound. Give your answer to the appropriate number of significant figures. (R = 8.31 J mol-1 K-1)

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5.

Calculate the percentage uncertainty in each of the use of the pipette (±0.1 cm³) and the burette (±0.15 cm³ which is a combination of start, final and end-point uncertainties)
pipette measured 25.0 cm³
burette measured 24.78 cm³

3

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6.

please show the answer here (i.e. mol of copper (II) sulphate, mol of copper oxide, mass of copper oxide)