Hi, could someone help me to solve this?

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n = MV

where,

n = number of moles

M = molarity

V = volume

First, we find the total number of moles after combining both solutions.

Note that 1 dm3 = 1000 cm3.

Total n = 100*1/1000 + 50*4/1000 = 0.3 moles

Total volume = 100 + 50 = 150 cm3

New molarity, M = n/V = 0.3/(150/1000) = **2 mol/dm3**

Owhh thanks a lot!