# Chemistry

posted by .

could you please check my work? thanks.

For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles.

2A (g) + B (g)-----> 3 C (g)

a. find the rate of reaction with respect to A (in Ms^-1)
b. find the rate of the reaction with respect to B
c. find the reate of the reaction with respect to C

so far i have for part a:
rate = delta [A]/delta t
i calculated the molarities of before and after:
4.925mols/3.00L = 1.64 M
2.727mols/3.00L = .912 M

delta M = .728
but that's supposed to be negative because the number of mols decreases correct?
so i got -.728 M

delta t = 6.85 (0 to 6.85 seconds)

so rate a = -(.728M/6.85 seconds)
but since reactants are involved it should be negative on the outside too, so it's
=-(-.728M/6.85 s)
=.106 Ms^-1

is that correct????
to find b woul i just divide the mols of A by two????

## Similar Questions

1. ### Chemistry

HELP! we just started kinetics and i have no clue how to solve this problem. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after …
2. ### AP CHEM-URGENT PLEASE

could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g)
3. ### CHEMISTRY

could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g)
4. ### Chemistry

This is for a titration, to measure the amount of acid that can be neutralised by gaviscon. I know how to work out the first 3 but I'm not sure on the others. I think i need to use the calculation c=n x v but i don't know where and …
5. ### Chemistry

I am super confused when it comes to these types of questions! Can someone check my work?
6. ### chemistry

Hey, I need help finding out how many moles of CO2 is produced from this reaction. Any help is appreciated, thanks. Mass of empty Erlenmeyer flask (g): 88.000 g Mass of Erlenmeyer flask and 20 mL H2SO4: 112.198 g Mass of 20 mL H2SO4: …
7. ### Chemistry

Consider the generic reaction between reactants A and B: 3A+4B→2C How many moles of B will be in the reaction vessel once the reactants have reacted as much as possible?
8. ### Chemistry

can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks! 1.In the …
9. ### Chemistry

can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks! 1.In the …
10. ### ChEM ASAP PLZ

n the water gas shift reaction (below, unbalanced), equal masses of methane and water were placed in the reactor and the total mass of the reactants was 274 kg. _______ CH4 (g) + _______ H2O (g) → _______H2 (g) + _______ CO2 (g) …

More Similar Questions