<span>Because you've added coefficients to the molecules on the right side of the equation, the number of oxygen atoms has changed.</span>
Magnetism, or more specifically electromagnetic repulsion
Answer:
The expression to calculate the mass of the reactant is 
Explanation:
<em>The amount of heat released is equal to the amount of heat released per gram of reactant times the mass of the reactant.</em> To keep to coherence between units we need to transform 1,080 J to kJ. We do so with proportions:

Then,

High tide or Neap tides which are normally really high.