what chemical is H2CO3?
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Carbonic acid, which falls apart into CO2 and H2O.
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PH3:                           Phosphine\nAg2SO3:                    Silver Phosphite\nFeCO3:                      Iron(II) Carbonate\nN2O4:                        Dinitrogen tetroxide\nPb(OH)2:                   Lead(II) Hydroxide
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Acetic acid (HC2H3O2, or CH3COOH). Vinegar.
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The answer given earlier is more feasible i.e decomposing sodium hydrogen carbonate, the equation thus:\n\n2NaHCO3 --> Na2CO3 + CO2 + H2O\n\nBut, the decomposition for your specific enquiry thus:\nNa2CO3 --> CO2+Na2O\n\nI hope this helps
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C4H10\n\nCH3-CH2-CH2-CH3
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barium acetate and carbon dioxide and water
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Co(NH3)4 would be more likely
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Carbonic acid forms when carbon dioxide dissolves in water and can only be found in solution form.
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CaCO3(s) + 2HC2H3O2(aq)-> Ca(C2H3O2)2(aq) + H2O(l) + CO2(g)
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Copper reacts with carbon dioxide in the presence of moisture to form copper carbonate, which is green.  More precisely this is a cupric carbonate/cupric hydroxide complex:  CuCO3/Cu(OH)2.  Likely some cuprous carbonate is also present Cu2CO3.
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CO3^2- + 2H^+ ===> CO2 + H2O
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C3H7NO2 \n\nwww.chemfinder.com is a useful resource.  \n\nI hope this helps :)
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2NaOH + CO2 = Na2CO3 + H2O
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sodium bicarbonate \nits chemical compound, NaHCO3, which is a white crystalline or granular powder, commonly known as bicarbonate of soda or baking soda. It is soluble in water and very slightly soluble in alcohol.
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Carbon Dioxide and Water
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Well, there's a decomposition reaction.\n\nH2CO3 <--> H2O + CO2\n\nCarbonic acid (H2CO3) doesn't not exist much at all, because it decomposes into H2O and CO2. But some of the carbonic acid remains, pushing up the hydronium concentration, which by definition makes water more acidic. Therefore, getting rid of the CO2 in water makes water less acidic (raising the pH).
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Lead (II) bicarbonate is Pb(HCO3)2.\nPb(CO3) is lead (II) carbonate.\n\nNote bicarbonate is a common name.  Hydrogen carbonate is a better name.  Note that if you said just lead bicarbonate there can be confusion.  It could be\n\nPb(II)(HCO3)2 or Pb(IV)(CO3)2 depending on how you interpret the "bi".