41 g of mgcl^2 is how many moles of magnesium chloride?

0.43 mol.

Explanation:

no. of moles (n) = mass/molar mass

mass of MgCl₂ = 41.0 g & molar mass of MgCl₂ = 95.211 g/mol.

∴ n = mass/molar mass = (41.0 g)/(95.211 g/mol) = 0.43 mol.

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

its first and third is your answer i did the qustion the fourth isnt right