When gaseous nitrogen and gaseous hydrogen are reacted at high temperatures in the presence of a catalyst, ammonia (and no other product) is formed. If a chemical plant has to synthesize 450 kg of ammonia, what mass (in kilograms) of hydrogen has will be required, assuming 100% yield? (Use molar masses: hydrogen = 10 and nitrogen = 14,0 g/mol.) Give your answer to 2 significant figures. In the precipitation reaction: AlCl3(aq) + 3 NaOH(aq) – AKOH)3(s) + 3 NaCl(aq), what volume of 0.200 M NaOH(aq) solution would be required to react completely with 25.0 mL of a 0.100 M solution of AlCl3(aq)?
a) 150.0 mL
b) 12.5 ml
c) 4.2 ml
d) 37.5 mL

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explanation:

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what is the question?

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