7 3 points
Tin (11) fluoride, SnF2, is found in some toothpastes. Tin (11) fluoride is made by reacting solid tin with hydrogen fluoride according to the following
BALANCED equation.
Sn (s) + 2 HF (8) - SnF2 (s) + H2(8)
How many grams of hydrogen gas will be produced if 3.9 moles of tin react?

28528289 29823282 8298232 39858

i think its 5049.

i hope this !

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