1. You have 4.0 g of NaCl. Calculate the number of moles of
NaCl this is (show your work).

Explanation:

i suppose this is chemistry..

no of moles = mass / molar mass

you are given the mass, 4.0g, you need to find the molar mass ( Mr ) of NaCl.

Mr = 23 + 35.5

Mr = 58.5

now that you know the Mr of Nacl, just use the formula:

n = m/mr

n= 4/ 58.5

n= 0.068376..

no of moles = 0.068 moles.

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers