30.4 kJ is required to melt one mole of NaCl . The entropy change during melting is 28.4 J mol-1 K-1 . What is the melting point of sodium chloride?

Question

30.4 kJ is required to melt one mole of NaCl . The entropy change during melting is 28.4 J mol-1 K-1 . What is the melting point of sodium chloride? (A)  1070.4 K  (B)  535.2 K  (C)  273.1 K  (D)  1007.4 K

Tardigrade Admin · Accepted Answer

NaCl(sarrow NaCl(l) Δ S = (Δ H/ textTemp) T = (Δ H/Δ S) = (30.4 × 103/28.4) = 1070.4 K

Q. $30.4 k J$ is required to melt one mole of $N a Cl$ . The entropy change during melting is $28.4 J m o l^{- 1} K^{- 1}$ . What is the melting point of sodium chloride?

$1070.4 K$

$535.2 K$

$273.1 K$

$1007.4 K$

$N a Cl (s \to N a Cl (l)$
$Δ S = \frac{Δ H}{Temp}$
$T = \frac{Δ H}{Δ S}$
$= \frac{30.4 \times 1 0 ^{3}}{28.4}$
$= 1070.4 K$

Q. 30.4kJ is required to melt one mole of NaCl . The entropy change during melting is 28.4Jmol−1K−1 . What is the melting point of sodium chloride?

1070.4K

535.2K

273.1K

1007.4K