Q53E - Chemistry (OpenStax)

Question

Question: Write the formulas of the following compounds: 

(a) rubidium bromide 

(b) magnesium selenide 

(c) sodium oxide 

(d) calcium chloride 

(e) hydrogen fluoride 

(f) gallium phosphide 

(g) aluminum bromide 

(h) ammonium sulfate

Step-by-Step Solution

Answer

1. \(RbBr\)
2. \(MgSe\)
3. \(N{a_2}O\)
4. \(CaC{l_2}\)
5. \(HF\)
6. \(GaP{O_4}\)
7. \(AlB{r_3}\)
8. \(A{l_2}{\left( {S{O_4}} \right)_3}\)

Step 1. Writing individual atoms/molecules with their charge

\(R{b^ + }\)   \(B{r^ - }\)   \(M{g^{2 + }}\)   \(S{e^{2 - }}\)   \(N{a^ + }\)   \({O^{2 - }}\)   \(C{a^{2 + }}\)   \(C{l^ - }\)   \({H^ + }\)   \({F^ - }\)   \(G{a^{3 + }}\)   \(PO_4^{3 - }\)   \(A{l^{3 + }}\)   \(SO_4^{2 - }\)

Step 2. Criss-crossing charges with elements present in compound

After criss-crossing, we get

1. \(RbBr\)
2. \(MgSe\)
3. \(N{a_2}O\)
4. \(CaC{l_2}\)
5. \(HF\)
6. \(GaP{O_4}\)
7. \(AlB{r_3}\)
8. \(A{l_2}{\left( {S{O_4}} \right)_3}\)