An aqueous solution of sodium phosphate is a 0.142 M Na3PO4(aq) has a density of 1.02 g/ml What is the percent by mass of sodium phosphate ?

What is the mole fraction of sodium phosphate

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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dynamic equilibrium is the answer.