Calculating H value PLEASEE HELP MEEE!!!!! (grade 12 chem)?
ok so i am give this FeO(s)+CO(g)-->Fe(s)+CO2(g) H=? Use these 3 reactions Fe2O3(s)+3CO(g)-->2Fe+3CO2(g) H=-25.0kj 3Fe2O3+CO(g)--->2Fe3O4(s)+CO2 H=-47.0 Fe3O4(s)+C)(g)--->3FeO(s)+CO2(g) H=38.0 please help me this is one of the hardest units for me and im not understanding it HELPP!! <3
Chem Prob Rate of reaction?
a) calculate MW of P4O10 = 283.889044 g/mol b) convert 1.5mol to grams. = 1.5mol x 283.889044g/mol = 425.833566grams of P4O10 c) 30 seconds to minutes = 30 seconds x 1min/60seconds = 0.5min d) 425.833566g/0.5min = 851.667132g/min
Rate of reaction grade 12 chem?
I meant production of product 1 hour ago - 1 week left to answer. Additional Details rate of reaction i *is rate at which products are formed : *or rate at which reactants are consumed? *so the rate of consumption and production should be equal? but say you have like na+h2so4-->nas04 +h2 *the rate of consumption of na can be diferent from h2so4 *and rate of product of each individual product is also different so how is rate of reaction equal to rate at which products are formed and reactants consumed? is it in regard to each individual product and reactanct so it depends on stoichometery?
Average rate of reaction for volcano reaction?
So for my culminating performance task (CPT) I have to design and create a lab regarding the volcano reaction. By volcano reaction I also mean the reaction between acetic acid and sodium bicarbonate. Each person also has to measure something differently, and I got average rate of reaction. Even though it is probably the easiest topic, I can't really figure out how to measure the average rate, without disturbing the experiment. I don't even know what units to use for the rate, as I don't think I can use mol/min, or grams/min, as it would disrupt the experiment. The only thing I can think of is degrees/min (temp), and use a calorimeter. Its for grade 12 university chemistry if that is at all relevant.. Any help is greatly appreciated!
What is the difference between molecularity and order of reaction?
DEFINITION: Order Sum of the exponents of the molar concentration(s) in the rate law expression. Molecularity The number of atoms, ions, molecules that must collide with one another simultaneously to result into a chemical reaction.Order need not be a whole number. It can be fractional or zero. Molecularity is always a whole number.Order can be determined experimentally only. Molecularity can be calculated by adding the no. of molecules in the slowest step (directly by looking at the balanced equation).Order is applicable to simple + elementary reactions. Molecularity is applicable to simple reactions. No significance in determining molecularity of a complex reaction.Order cannot be determined by looking at the stoichiometric coefficients. Molecularity can be determined by looking at the stoichiometric coefficients.
Grade 12 Chemistry question about rate laws, please help! :(?
a) The reaction equation is A + 2 B → C The reaction is zeroth order w.r.t. A and first order w.r.t. B, thta means rate of reaction is given by: r = k∙[A]⁰∙[B]¹ = k∙[B] Rate of change for each component can be found by multipliyng the rate by its stoichiometric coefficient. For this reaction d[A]/dt = (- 1)∙r = -r d[B]/dt = (- 2)∙r = -2∙r d[C]/dt = (+ 1)∙r = r That means rate of disapperance of A equals rate of reaction: - d[A]/dt = r = k∙[B] To find the rate constant solve this relation for k and apply the given concentration and rate of change: k = - d[A]/dt / [B] = 1.2 M∙s⁻¹ / 0.2 M = 6 s⁻¹ b) At this concentration level of B the rate of reaction is r = k∙[B] = 6 s⁻¹ ∙ 0.15 M = 0.9 M∙s⁻¹ So the rate of consumption of the reactants is: - d[A]/dt = r = 0.9 M∙s⁻¹ - d[B]/dt = 2∙r = 1.8 M∙s⁻¹ The rate of formation of product is d[C]/dt = r = 0.9 M∙s⁻¹
What is the order of reaction whose rate constant has the same units as the rate of reaction?
The order of the reaction is zero. This is because a zero-order reaction has a constant rate that is independent of the reactant's concentrations. The rate law is as follows:rate=kTo understand more contact Sapna Jha (CEO/Founder of Learn Chemistry faster!) at sapna.jha@chemistryclass.org.
Finding rate of consumption from rate of formation?
In a particular study of the reaction described by the equation, 2 CH4O(g) + 3 O2(g) → 2 CO2(g) + 4 H2O(g), the rate of consumption of O2(g) is 0.400 mol L-1 s-1. What is the rate of formation of H2O(g) in the study? 1. 0.300 mol L-1 s-1 2. 1.33 mol L-1 s-1 3. 0.533 mol L-1 s-1 4. 0.800 mol L-1 s-1 5. 0.400 mol L-1 s-1
What are the chapters of chemistry from which numericals are asked generally in class 12 CBSE?
1)Solids2)Solutions (Elevation of boiling point, depression of freezing point & vapour pressure)3)Chemical Kinetics(Questions at the back)4)Electrochemistry ( Nernst equation and Faraday's Laws)The ones mentioned within the brackets are the important ones.All the best!