Give the molar mass to the nearest whole number of each of the following: (a) thallium(I) phosphate WebAssign will check your answer for the correct number of significant figures. 708 Correct: Your answer is correct. g/mol (b) manganese(II) nitrite WebAssign will check your answer for the correct number of significant figures. 178.96 Incorrect: Your answer is incorrect. g/mol (c) ruthenium(III) sulfate WebAssign will check your answer for the correct number of significant figures. 490 Incorrect: Your answer is incorrect. Check the number of significant figures. g/mol (d) silver carbonate WebAssign will check your answer for the correct number of significant figures. g/mol (e) chromium(III) oxide WebAssign will check your answer for the correct number of significant figures. g/mol More Information.