How many moles of helium are needed to fill a balloon to a volume of 4.9 at 296°K and 0.78 atm?

this may help

Explanation:

pressure, volume, temperature, and the number of moles, it was clear that a single. atm of pressure within safety limits, how much gas can it safely carry at room. 0.21 atm. Ar has a partial pressure of 0.01 atm. PN2 .78 atm 0.78 moles nN2.

answer: i have one answer

acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (h+) ions

explanation:

hope this and sorry i could only come up with one answer!

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