anyone know how to contact...everytime i try to use the contact page with the email and username it says in red writing sorry ur request cannot be submitted multiple times and on that page i cant click on my profile or anything else, it wont go through and I swear they r doing it on purpose. Im mad because i tried to sign up but then the payment didn't go through cause there was a card error or something and a screen popped up that said there was an error in red writing it is was denied so i thought i wasn't getting the subscription and i wasn't getting charged..and here i am getting charged 24 dollars for something I am not gonna used like...i want a refund

OMG

Explanation:

SAME THING HAPPENED TO ME! I KNOW THEY DO IT JUST TO BE IRRITATING. ITS VERY ANNOYING!

im very mad...but ya know what would make me happy?

getting brainliest?

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.