Nacl has a mc020-1.jpghfus = 30.2 kj/mol. what is the mass of a sample of nacl that needs 732.6 kj of heat to melt completely?
24.3 g
82.7 g
1,407.1 g
1,417.7 g

May someone me with these science questions

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

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