Question

multiple choice

1. which compound has the largest molecular mass?

□ zn(h₂po₄)₂
□ c₃h₇cooh
□ ba(oh)₂
□ al₂(so₃)₂

Explanation:

Step1: Calculate molar mass of $Zn(H_2PO_4)_2$

The molar mass of $Zn$ is $65.38\ g/mol$, $H$ is $1.01\ g/mol$, $P$ is $30.97\ g/mol$, $O$ is $16.00\ g/mol$.
$M_{Zn(H_2PO_4)_2}=65.38 + 4\times1.01+2\times30.97 + 8\times16.00=65.38+4.04 + 61.94+128.00 = 259.36\ g/mol$

Step2: Calculate molar mass of $C_3H_7COOH$

The molar mass of $C$ is $12.01\ g/mol$, $H$ is $1.01\ g/mol$, $O$ is $16.00\ g/mol$.
$M_{C_3H_7COOH}=4\times12.01+8\times1.01 + 2\times16.00=48.04+8.08+32.00 = 88.12\ g/mol$

Step3: Calculate molar mass of $Ba(OH)_2$

The molar mass of $Ba$ is $137.33\ g/mol$, $O$ is $16.00\ g/mol$, $H$ is $1.01\ g/mol$.
$M_{Ba(OH)_2}=137.33+2\times16.00 + 2\times1.01=137.33+32.00+2.02 = 171.35\ g/mol$

Step4: Calculate molar mass of $Al_2(SO_3)_2$

The molar mass of $Al$ is $26.98\ g/mol$, $S$ is $32.07\ g/mol$, $O$ is $16.00\ g/mol$.
$M_{Al_2(SO_3)_2}=2\times26.98+2\times32.07+6\times16.00=53.96 + 64.14+96.00 = 214.1\ g/mol$

Answer:

$Zn(H_2PO_4)_2$