A polyester is formed by the condensation polymerisation of 150 molecules of 3-hydroxypropanoic acid, HOCH2CH2COOH\text{HOCH}_2\text{CH}_2\text{COOH}HOCH2CH2COOH. What is the relative molecular mass, MrM_rMr, of the resulting polyester? (Use the following relative atomic masses: H=1.0\text{H} = 1.0H=1.0, C=12.0\text{C} = 12.0C=12.0, O=16.0\text{O} = 16.0O=16.0)