!QUICK! Ive posted this same question 4 times so pls help, also once u do feel free to answer the other same ones to get more points!!!
Write word equations for each chemical equation
2H2 + O2= 2H2O liquid
N2+ 3H2=2NH3
2Na+ Cl2=2NaCl
2KI+Pb(NO3)2=2KNO3+PBI2
by Shbi0822 Yesterday

Hydrogen gas plus oxygen gas yields liquid water.

Nitrogen gas plus hydrogen gas yields ammonia.

Aqueous sodium ions plus aqueous chloride ions yields sodium chloride (table salt).

Solid potassium iodide plus aqueous lead nitrate yields potassium nitrate plus lead iodide. (Not sure about the states, because they aren't included in the question.)

it's all four options.

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