Find the molar mass of (NH4)2Cr207.
Answer in units of g/mol.

Answer and Explanation:

252.0649 g/mol

Nitrogen: 14.007 g/mol

Hydrogen: 1.00794 g/mol

Chromium:  51.9961 g/mol

Oxygen:  15.999 g/mol

( 2 x14.007 ) +( 8 x1.00794 ) + ( 2 x 51.9961 )+(7 x15.999 )=252.06 g/mol

346.05 g/mol

Explanation:

To find Molar Mass you basically just need to add up the atomic masses of the elements in the compound then add g/mol after.

So you would add:

(14.01+4x1.01)+(2x52.00)+(2x16.00x7)

(18.05)+(104)+(224)

=346.05 g/mol

*I hope that 0 is referring to Oxygen, if It isn't, this is not correct!*

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

dynamic equilibrium is the answer.