Pleaseee help A chemist measures the enthalpy change AH during the following reaction:

2 Na(s) + Cl2(9)-2 NaCl(s)

AH=-822. kJ

Use this information to complete the table below. Round each of your answers to the nearest kJ/mol.

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %