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Recent content by Daniel Avarro

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Chemistry: Post your doubts here!

Since it is 1cm3, the mass is 1g(density is 1g/cm3) the moles of water in 1g is 1/18 = 0.0556. 1 mole uses 24dm3. Therefore, 0.056 moles uses 0.0556 x 24 = 1.33dm3. Now, that is for 298K. We need to find it for 596K. Since pv=nRT, n is proportional to Temperature so 596/298 x 1.33 = 2.67dm3
- Daniel Avarro
- Post #18,052
- Jun 6, 2018
- Forum: A-Levels
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Chemistry: Post your doubts here!

It is ideal. If you use the equation. P1V1/T1 = P2V2/T2 you get that they are equal. WORKING ---------------- V2 = v1/2(volume halved) 16V/300 = (40v/2)/375 You get the answer that both are equal
- Daniel Avarro
- Post #18,051
- Jun 6, 2018
- Forum: A-Levels
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A level Biology: Post your doubts here!

C?
- Daniel Avarro
- Post #8,134
- Jun 5, 2018
- Forum: A-Levels
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A level Biology: Post your doubts here!

23 is C because Number 2. is wrong. The nucleotides are different. DNA has a deoxyribose sugar and RNA has a ribose sugar 18 is D. Because the rate is constant at one point, that there's a limiting factor(presence of channel protein).
- Daniel Avarro
- Post #8,129
- Jun 5, 2018
- Forum: A-Levels

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