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AS topic 1 calculations allsorts

Posljednje ažuriranje 2 months ago

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2

Pitanje 1

1.

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

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4

2

Pitanje 2

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.

Pitanje 3

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

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Pitanje 4

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)

Pitanje 5

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

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Pitanje 6

6.

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