calculate the relative atomic mass of calcium given that the number of moles in 0.4 moles and mass is 16 g

The relative atomic mass of Calcium : 40 g/mol

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass / the relative atomic mass(Ar) :

Calcium (Ca) :  

moles = 0.4

mass = 16 g

Write about something scary you have been through and how you overcame it or had help overcoming it.

Explanation:

here's an example: When I was Five i was unconscious after going down a slide into a lake. I was unconscious because on the way down i hit my head on the side. My parents did not know that happened. i was unconscious underwater for a bout a minute until my parents came out to check and see if i was out there because they were looking for me . They did not know where i was. They checked on the boat and found me face down underwater. My dad jumped in to save me and my mom called 911. This was the scariest time in my life and in their life as well. They told me i will never leave their site until i learned not to disobey their rules even if i did not agree with them. I quickly learned to never do things without permission again very fast.