- Help solving limits?

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Can anyone help me with this thermodynamics problem? Why the choice of wavelength on the
colorimeter is important.? Perchè i sassi sulla riva del mare sono PIATTI? How do I rearrange this to find m 100*2.5+m*20.298=(100+m)*10? If the density of an unknown gas is 4.38 g/L
at −4.00◦C and 4.82 atm, what is its molar
mass?
Answer in units of g/mol.?