An unknown group 1 metal carbonate m2co3 (m=li, na or k) was reacted with excess 2 m hcl and the mass of co2 released was determined by mass difference. the initial mass of solid m2co3 was 2.002 g and the mass of co2 released was 1.206 g.

a. write the balanced chemical equation for the reaction of m2co3 with hcl.

b. what is the mole ratio of co2 to m2co3

c. calculate the molar mass of the unknown metal carbonate and identify the group 1 metal.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol