Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy change represented by x?

3c + 3o2 yields 3co2 deltah = -1182 kj

4h2 + 2o2 yields 4h2o deltah =-1144 kj

c3h8 + 5o2 yields 3co2 + 4h2o deltah = x

3h8 3c + 4h2 h = 104 kj

a. 104 = (-1182) - [x + (-1144)]

b.104 = x - [(-1182) + (-1144)]

c.104 = (-1182) + (-1144) + x

d.104 = x + (-1182) - (-1144)

Calculate the number of molecules present in 0.750 mol of mgo.

The diagram below shows a cell placed in a solution. a cell is shown placed inside a beaker. it is labeled cell. the solution inside the beaker is labeled 40% salt solution and the solution inside the cell is labeled 20% salt solution. only water is allowed to move in and out of the cell. what will most likely happen to the cell? it will expand as water moves out of it. it will shrink as water moves out of it. it will expand as water moves into it. it will shrink as water moves into it.

In a reaction equation, where are the products located? a.) above the arrow b.) to the right of the arrow c.) to the left of the arrow d.) below the arrow