Robert Bunsen discovered that heating elements in a flame of his famous burner generated colorful flames. Each element or compound created different bands of color when he passed the light from the flame through a prism. Scientists use the same techniques today to research elements and compounds. If the measured wavelength of a light wave is 6.20 x10-7 meters, what is the frequency of the light? 3.00x108 Hz
3.00x10, 8, Hz

4.84x1014 Hz
4.84x10, 14, Hz

2.07x10-15 Hz
2.07x10, -15, Hz

1.86x102 Hz

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