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Correctly balance the following equations. (a) Na_(s) +H_2O_(l) rightarrow NaOH(

ID: 505610 • Letter: C

Question

Correctly balance the following equations. (a) Na_(s) +H_2O_(l) rightarrow NaOH() + H_2(g) (b) Fe_2O_3() + H_2(g) rightarrow^Delta Fe _(s) + H_2O_(g) (c) C_8H_18(g) + O_2(g) rightarrow CO_2(g) + H_2O_(l) (d) Mg_3N_2(s) +H_2O_(l) rightarrow Mg(OH)_2(aq) + NH_3(aq) Show that the following Chemical equation obeys the Law of Conservation of Mass. Molar masses can be found on a periodic table. CH_4(g) + O_2(g) rightarrow CO_2(g) + H_2O_(g) 3. Hexane, C_6 H_14, is a flammable, organic solvent (a) How many mole of CO_2, form if 0.450 mol of hexane is burned? (b) How many mole of O_2 is consumed? The balanced equation is: 2 C_6H_14(l) + 19 O_2(g) rightarrow 12 CO_2(g) + 14 H_2O_(l).

Explanation / Answer

Q1.

Balacne

Na(s) + H2O(l) --> Na(OH) + H2(g)

balance H

Na(s) + H2O(l) --> Na(OH) + 1/2H2(g)

Thos is now balanced

b)

Fe2O3(s) + H2(g) --> Fe(s) + H2O(g)

balance Fe

Fe2O3(s) + H2(g) --> 2Fe(s) + H2O(g)

Balance O

Fe2O3(s) + H2(g) --> 2Fe(s) + 3/2H2O(g)

Balance H

Fe2O3(s) + 3H2(g) --> 2Fe(s) + 3H2O(g)

c)

C8H18(g) + O2(g) ---> CO2(g) + H2O(l)

balance c

C8H18(g) + O2(g) ---> 8CO2(g) + H2O(l)

balance H

C8H18(g) + O2(g) ---> 8CO2(g) + 9H2O(l)

balance O

C8H18(g) + 25/2O2(g) ---> 8CO2(g) + 9H2O(l)

finally

d)

Mg3N2(s) + H2O(l) --> Mg(OH)2(aq) + NH3(aq)

balance Mg

Mg3N2(s) + H2O(l) --> 3Mg(OH)2(aq) + NH3(aq)

Balance N

Mg3N2(s) + H2O(l) --> 3Mg(OH)2(aq) + 2NH3(aq)

Balance O

Mg3N2(s) + 6H2O(l) --> 3Mg(OH)2(aq) + 2NH3(aq)

This is now balanced

Mg3N2(s) + H2O(l) --> 3Mg(OH)2(aq) + 2NH3(aq)

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