According to the third law of kepler, which one of the statements below is correct
a: the orbital period of venus is greater then the orbital period of saturn
b: the orbital period of earth is smaller then the orbital period of mars
c: the orbital period of mars is greater than the orbital period of saturn
d: the orbital period of venus is smaller then the orbital period of mercury
note: this is for geoscience but it didn't have an option for that

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

i'm pretty sure its b i might be wrong though!

pie chart because it is in percents ( % )

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