Which substance has the largest molar mass? o Thallium
O Chromium
O Molybdenum
O Beryllium

Give the number of significant figures in each measurement. By rule 1, all nonzero digits are significant, so this measurement has three significant figures. By rule 4, the first three zeros are not significant, but by rule 2 the zero between the sixes is; therefore, this number has four significant figures.