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Y12 Physical Chemistry > Amount of Substance Questions > Flashcards

Amount of Substance Questions Flashcards

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1
Q

number of moles in 35.0 g CuSO4

A

0.219

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2
Q

concentration of solution of 5.00g sodium carbonate in 250 ml water

A

0.189 M

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3
Q

mass of Cl2 gas with a pressure of 100 kPa, temp of 293 K, volume 500 cm^3. (R=8.31)

A

1.46 g

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4
Q

How many atoms of Sn in 6.00 g sample?

A

3.04 x 10^22

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5
Q

Number of chloride ions in 25 ml of MgCl2 solution with concentration 0.400 M?

A

1.20 x 10^22

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6
Q

How many molecules of ethanol in 0.500 dm^3 liquid with density 0.789 g cm^-3?

A

5.16 x 10^23

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7
Q

Calculate the empirical formula for a compound that contains 1.82 g of K, 5.93 g of I and 2.24 g of O

A

KIO3

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8
Q

Calculate the molecular formula for a compound with the empirical formula of C3H6H and a Mr of 116

A

C6H12O2

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9
Q

What mass of CO2 would be produced from heating 5.50 g of sodium hydrogencabonate

A

1.44 g

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10
Q

23.6 ml of sulfuric acid neutralised 25.0 ml of 0.150 M NaOH. What is the concentration of the acid?

A

0.0794 M

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11
Q

A 25 ml sample of vinegar was diluted in a 250 ml volumetric flask. This was then put in a burette and 23.10 ml of the diluted vinegar neutralised 25.0 ml or 0.100 M naOH. What is the concentration of the vinegar in g dm^-3

A

64.8 g dm^-3

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12
Q

What mass of Cu would react completely with 150 ml of 1.60 M nitric acid?

A

5.71g

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13
Q

What is the total volume of gas produced in dm^3 at 333K and 100 kPa when 0.651 g of magnesium nitrate decomposes when heated?

A

0.303 dm^3

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14
Q

What is the % atom economy when iron (III) oxide reacts with CO to form iron and carbon dioxide only?

A

45.8%

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15
Q

25.0 g of iron (III) oxide was reacted and produced 10.0 g of Fe. What is the percentage yield?

A

57.1 %

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16
Q

If 500 cm^3 of methane at 1 atm and 300K are burnt, what volume of oxygen would be needed and what volume of CO2 would be given off?

A

1 dm^3 O2

500 cm^3 CO2

17
Q

In the equation below, what is the total volume of gases produced when 500 cm^3 CO reacts with 500 cm^3 NO at 650 oC and 1 atm?
2CO + 2NO –> 2CO2 + N2

A

750 cm^3

18
Q

3.51 g of hydrated zinc sulfate were heated and 1.97 g of anhydrous zinc sulfate were obtained. Caculate the number of moles of water in the hydrated crystals.

A

7

19
Q

0.15 g of a volatile liquid was injected into a sealed gas syringe. The syringe was placed in an oven at 70 oC and a pressure of 100 kPa and a volume of 80 cm^3 was measured. What is the Mr of the volatile liquid? (R=8.31)

A

53.4 g mol^-1

Y12 Physical Chemistry (7 decks)

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