PLEAS HEL I BE FOR HEL PLEAS

How many molecules are in 25.4 grams of dinitrogen pentoxide, N2O5?

There are molecules in 25.4 g of

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.

To calculate the moles, we use the equation:

1 mole of contains =   molecules

Thus 0.235 moles of contains = molecules.

There are molecules in 25.4 g of

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6