Question

if 1.25grams of sodium carbonate is dissolved in a 250 centimeter cube. How many grams will be dissolved up to a one molar?.

Answer 1

Your post needs to be rephrased. It doesn't make sense as is. It will take 106/4 grams Na2CO3 dissolve in 250 cc SOLUTION to make 1 M but that has nothing to do with the solution you have.