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- 1. Question
Upon heating 1.25g of a solid, 280cm3 of a gas measured at s.t.p were evolved and a residue of 0.7g was left. Calculate the molar mass of the gas? (molar volume of gas at s.t.p= 22.4dm3)CorrectIncorrect
- 2. Question
2g of a mixtureof Na2CO3 and Nacl were disolved in a 250cm3 standard flask 25cm3 portions of this solution required 26.6cm3 of 0.100mol dm-3 HCL for neutralization. What is the percentage by mass of Na2CO3 in the mixture?CorrectIncorrect
- 3. Question
148g of salt (z) dissolved in 250cm3 of distilled water gives a concentration of 0.08mol dm-3. Calculate the molar mass of the salt (z)………………..CorrectIncorrect
- 4. Question
Consider the reaction represented by the following equation: Zn(s) + 2HCL -> ZnCl2(aq) + H2(g). What volume of hydrogen gas is produced at s.t.p when 3.25g of zinc reacts with excess dilute HCL? (Zn = 65, molar gas volume at s.t.p. = 22.4 dm3)……………..CorrectIncorrect
- 5. Question
Consider the reaction represented by the equation: 2NaHCO3 -> Na2CO3 + H2O + CO2. What is the mass of sodium trioxocarbonate(IV) produced by the complete decomposition of 33.6g of sodium hydrogen trioxocarbonate(IV)? (NaHCO3 = 84, Na2CO3 = 106 )CorrectIncorrect