14) find the molar mass of each of the following:\n a. hno₃\n b. cr(no₃)₃\n c. (nh₄)₃po₄

Answer

Explanation:

Step1: Recall molar - mass formula

The molar mass of a compound is the sum of the molar masses of its constituent elements. The molar mass of an element is equal to its atomic mass in g/mol.

Step2: Calculate molar mass of (HNO_3)

The atomic masses of (H = 1.01\ g/mol), (N=14.01\ g/mol), and (O = 16.00\ g/mol). [M_{HNO_3}=1\times1.01 + 1\times14.01+3\times16.00=1.01 + 14.01+48.00 = 63.02\ g/mol]

Step3: Calculate molar mass of (Cr(NO_3)_3)

The atomic mass of (Cr = 52.00\ g/mol), (N = 14.01\ g/mol), and (O = 16.00\ g/mol). [M_{Cr(NO_3)_3}=52.00+3\times(14.01 + 3\times16.00)=52.00+3\times(14.01 + 48.00)=52.00+3\times62.01=52.00 + 186.03=238.03\ g/mol]

Step4: Calculate molar mass of ((NH_4)_3PO_4)

The atomic masses of (N = 14.01\ g/mol), (H = 1.01\ g/mol), (P = 30.97\ g/mol), and (O = 16.00\ g/mol). [M_{(NH_4)_3PO_4}=3\times(14.01+4\times1.01)+30.97 + 4\times16.00=3\times(14.01 + 4.04)+30.97+64.00=3\times18.05+30.97 + 64.00=54.15+30.97+64.00 = 149.12\ g/mol]

Answer:

a. (63.02\ g/mol) b. (238.03\ g/mol) c. (149.12\ g/mol)