What mass of carbon dioxide is produced when 12.0 g of carbon react with 32.0 g of oxygen to form 44.0 g of carbon dioside, which of these statements is false?

-

44 g

Explanation: -

Mass of Carbon = 12 g.

Molar mass of carbon = 12 g / mol

Number of moles of C =

= 1 mol

Molar mass of O₂ = 16 x 2 = 32 g / mol

Number of moles of O₂ =

= 1 mol

The balanced chemical equation for this process is

C + O₂ →CO₂

From the equation we see

1 mol of C reacts with 1 mol of O₂

Here both the reactants are present in required amounts.

Now we see again from the balanced equation

1 mol of C gives 1 mol of CO₂

Molar mass of CO₂ = 12 x 1 + 16 x 2 = 44 g / mol

Mass of CO₂ formed = number of moles x molar mass

= 1 mol x 44 g / mol

= 44 g

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

50.23 i believe is correct but don't quote me on that.