diff --git a/libscience/isotope.cpp b/libscience/isotope.cpp
--- a/libscience/isotope.cpp
+++ b/libscience/isotope.cpp
@@ -94,7 +94,6 @@
 QString Isotope::abundance() const
 {
     return m_abundance.value().toString();
-    return QString();
 }
 
 double Isotope::halflife() const
diff --git a/src/calculator/concCalculator.cpp b/src/calculator/concCalculator.cpp
--- a/src/calculator/concCalculator.cpp
+++ b/src/calculator/concCalculator.cpp
@@ -288,7 +288,6 @@
     case 1:     // cannot be calculated (insufficient data)
         error(INSUFFICIENT_DATA_MOLE);
         return;
-        break;
     case 2:     // molality specified
         numMoles = massSolvent() / 1000.0 * m_concentration;
         break;
@@ -296,7 +295,6 @@
     case 4:
         error(INSUFFICIENT_DATA_MOLE);
         return;
-        break;
     case 5:     // mole fraction specified
         numMoles = m_concentration / (100.0 - m_concentration) * molesSolvent();
         break;
@@ -328,7 +326,6 @@
     case 0: // molarity not sufficient
         error(INSUFFICIENT_DATA_EQT);
         return;
-        break;
     case 1: // normality specified
         numEqts = volumeSolvent() * m_concentration;
         break;
@@ -338,7 +335,6 @@
     case 5:
         error(INSUFFICIENT_DATA_EQT);
         return;
-        break;
     }
 
     if (type2 == 2) {    // Amount of solute specified in moles, cannot calculate
@@ -368,8 +364,7 @@
     case 3:         // mass fraction specified
     case 4:         // volume fraction specified
         error(INSUFFICIENT_DATA_SOLVENT);
-        return;
-        break;      // cannot be calculated (insufficient data)
+        return;     // cannot be calculated (insufficient data)
     case 5:         // mole fraction specified
         numMoles = (100.0 - m_concentration) / m_concentration * molesSolute();
         break;
@@ -623,6 +618,7 @@
         break;
     case 2:
         volume = massSolute() / densitySolute();
+        break;
     default:
         volume = 0;
         break;