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3 years ago

How many moles of carbon dioxide are produced when 19.3 mol of propane gas is burned in excess oxygen?

Chemistry

1 answer:

stepan [7]3 years ago

5 0

A.57.9mol of co2 is the answer.

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Which elements make up 95 percent (by weight) of the human body?

Alex17521 [72]

Oxygen,carbon,hydrogen,and nitrogen- together make up 95 percent of the mass of the human body.
Hope this helps.

3 0

3 years ago

For a particular first-order reaction, it takes 3.0 minutes for the concentration of the reactant to decrease to 25% of its init

grigory [225]

We will use this formula for first order:
㏑[A] = - Kt +Ao
when we have t (given)= 30 min = 30 x 60 = 1800 s (we here convert time from min to second.
then we assume that the initial concentration Ao = 1
and the concentration of A (final concentration = 0.25
So by substitution:
㏑(0.25) = - K * 1800 + ㏑(1)
1.39 = K * 1800
∴ K = 0.00077 s^-1 or 7.7 x 10^-4

5 0

4 years ago

Multiple choice-- please help!

kvasek [131]

The rate law for the reaction : r=k.[A]²

<h3>Further explanation</h3>

Given

Reaction

A ⟶ B + C

Required

The rate law

Solution

The rate law is a chemical equation that shows the relationship between reaction rate and the concentration / pressure of the reactants

For the second-order reaction it can be:

1. the square of the concentration of one reactant.

$\tt r=k[A]^2$

2. the product of the concentrations of two reactants.

$\tt r=k[A][B]$

And the reaction should be(for second order) :

2A ⟶ B + C

Thus, for reaction above (reactant consumption rate) :

$\tt r=-\dfrac{\Delta A}{2\Delta t}=k[A]^2$

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3 years ago

20 POINTS! FAST 1. Write a generic word equation and a chemical equation for the reaction that occurs

Anna35 [415]

I don’t know about 1 But number 2 is AB + xH2O = AB.xH2O

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3 years ago

A 4.00 M H3PO4 solution will contain ___ g of H3PO4 in 0.500 L of solution.

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