Q: Which is colder -210 or -223 degrees Celsius?

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This is a nice question to work with. For a gas, the product (P x V) is proportional to 'T'. ('Pressure', 'Volume', 'Temperature') But we have to be careful, because the temperature has to be referenced to absolute-zero. For Celsius, that's -273.15. -50 C = 223.15 K 200 C = 473.15 K The change in absolute 'T' was (473.15 / 223.15) = 2.12 times as great (rounded) So the product (P x V) must also become 2.12 times as great. If 'P' remains constant, then 'V' must become 2.12 times as great = (5 x 2.12) = 10.602 liters. According to the gas law pV=nRT, given as isobaric situation Volume is directly proportional to temperature. v1/t1= v2/t2 => v2=v1*t2/t1 v2= 5*(200+273)/(-50+273) v2=5*473/223 v2= 8.663 L

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-222.55 or -223

The chemical symbol of francium is Fr correct !

Seems some mistake in printing the mass number of thorium. It has to be 227. No Th-225 is available as far as the tables have been analysed. When a alpha particle comes out then the atomic number of parent is reduced by 2 and its mass number will be reduced by 4. So in case of Th-227, it gets changed to Ra-223 after the emission of an alpha particle.

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211, 223, 227, 229, 233, 239

acute angle

you'll need a thermometer for that.