You have a salt of the form where element X is a well-known, soft metal, grayish, with a unique oxidation number of +2 and common in living bones. For
On the other hand, element Y has a mass percentage of 19.97% in said salt.
to. Using this information, determine the identities of elements X and Y.
b. Write the electron configurations of each element, indicating whether it is
paramagnetic or diamagnetic.

Element X is Calcium

Element Y is Phosphorous

Explanation:

Electron Configuration for Calcium is [Ar] 4s²

Electron Configuration for Phosphorous is [Ne] 3s²3p³

Element X is Calcium

Element Y is Phosphorous

Explanation:

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g