How many molecules are there in 2.3g of carbon

1.15x10²³ molecules C

Explanation: solution attached:

Convert mass of C to moles using its molar mass then multiply to the Avogadro's number.

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

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )