# Chemistry

posted by .

Given the reaction: Ni (s) + 4 CO (g)  Ni(CO)4 (g) E = –154 kJ, how many kilograms
of CO are required for this reaction to release 756 kJ of energy?

• Chemistry -

Ni (s) + 4 CO (g)  Ni(CO)4 (g) E = –154 kJ

4*molar mass CO x (756/154)

• Chemistry -

hi. can you explain to me please why this solution please? THANK YOU

• Chemistry -

Ni (s) + 4 CO (g)  Ni(CO)4 (g) E = –154 kJ

1 mol CO = 12+16 = 28 g
4 mol CO = 4*28 = 112 g

112 g CO produces 154 kJ heat. You want 756 kJ. You know that will take more than 112 g so the ratio is 756/154 and
112 x (756/154) = ?

OR you can do it by proportion.
(112g/154 kJ) = (x/756) and
x = 112*756/154.

Ask yourself this question. If the rxn produces 154 kJ for 112 g CO, then how many g CO would be need to produce just twice as much heat (that's 154*2 = 308). The answer is obvious. If you want twice the heat you will need twice the fuel. How did you get that answer? By 112 x (308/154) = 112*2 = 224g CO

Or how much CO is needed to produce 3x as much heat. Of course the answer is 3x the amount of fuel. How do you get that?(3*154=462)
112 x (462/154) = 336 (or 3*112).

Therefore, if you don't want twice the amount or 3x the amount but you want 756 kJ, you will need 112g x (756 kJ/154 kJ) = ?g

## Similar Questions

1. ### Chemistry

Atom-Particle that cannont be divided in half becasue it is in its smallest form. Reactants-Substances that exist before the reaction begins. Endothermic Reaction-take in, or absorb heat energy. Exothermic Reaction- Release Heat energy …
2. ### Chemistry

I'm having a hard time with Redox and how to figure out which is redox Select all of the reactions that are redox reactions. I) Ca + 2H2O  Ca(OH)2 + H2 II) CaO + H2O  Ca(OH)2 III) Ca(OH)2 + H3PO4  Ca3(PO4)2 …
3. ### Chemistry

I'm having a hard time with Redox and how to figure out which is redox Select all of the reactions that are redox reactions. I) Ca + 2H2O  Ca(OH)2 + H2 II) CaO + H2O  Ca(OH)2 III) Ca(OH)2 + H3PO4  Ca3(PO4)2 …
4. ### Chemistry

If H for the reaction I2 (s)  2I (g) is 153 kJ/mol. What is the longest wavelength of light that can break an I – I bond?
5. ### chemistry

9). What is the balanced equation for the acid–base reaction of nitrous acid with lithium hydroxide?
6. ### Chemistry

Which of the following statements is incorrect concerning the thermochemical equation below?
7. ### Chemistry

H2 and F2 react according to the following equation, forming HF. H2(g) + F2(g)  2HF(g); H° = –271 kJ If H2(g) and F2(g) were mixed in a thermally insulated vessel, the reaction that occurred would be a. endothermic, …
8. ### Chemistry

Which of the following statements is incorrect concerning the thermochemical equation below?
9. ### Biology Help

Enzymes: a. increase the amount of energy release in a reaction b. decrease the amount of energy release in a reaction c. catalyze only redox reactions d. reduce the activation energy needed to for a reaction I think its d. or a. Help …
10. ### chemistry

17. Calculate H for the following reaction using Hess law H2 (g) + Br2 (g) → 2 HBr (g) Experimental information 2 H+ → H2 H -436.4 kJ 2 Br- → Br2 H -192.5 kJ 2 H+ + 2 Br- →2 HBr H …

More Similar Questions