Question

Calculate the mass of sodium carbonate formed when 4.2g of sodium hydrogen carbonate is heated

Answer 1

Answer:

1.325 Gram

Explanation:

2 NaHCO3(s) --- Na2CO3(s) + Co2(g) + H2O(g)

then ratio of moles is 2:1:1:1

the moles of NaHCO3 =4.2 / 168

= 0.025 moles

the ratio of NaHCO3 and Na2CO3 in moles is 2:1 then, moles of Na2CO3 is 0.0125 moles.

the weight of Na2CO3 is (mass=moles * molecular weight )

= 0.0125 * 106

= 1.325 g