Question

1) The sum of oxidation numbers of all atoms in K2Cr2O7 equals zero?

2) One mole of water contains 6.022 x 10^23 hydrogen atoms?

3) The following reaction is unbalanced, what are the coefficients of a balanced equation

Fe(NO3)3(aq)+Na2CO3(aq)-------->Fe2(CO3)3(s)+NaNO3(aq)

4) Using your Balanced equation. What is the net ionic equation? You have to balance question #3 in order to answer this question.

Fe(NO3)3(aq)+Na2CO3(aq)-------->Fe2(CO3)3(s)+NaNO3(aq)

Answer 1

1) K2Cr2O7 is a neutral compound and sum of oxidation number of elements is zero. True

2) 1 mole of water (H2O) contains 2*6.023*10^23 atoms of H. So, the given statement is false.

3) Balanced reaction,

2Fe(NO3)3(aq) + 3Na2CO3(aq) -----> Fe2(CO3)3(s) + 6NaNO3(aq)

4) 2Fe(3+)(aq) + 6NO3(-)(aq) + 6Na(+)(aq) + 3CO3(2-) ----> Fe2(CO3)3(s) + 6Na(+)(aq) + 6NO3(-)(aq)

2Fe(3+)(aq) + 3CO3(2-)(aq) ----> Fe2(CO3)3(s)