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Pepsi [2]
2 years ago
5

How many moles are in 272 grams of hydrogen peroxide (H2O2) ?

Chemistry
1 answer:
Strike441 [17]2 years ago
7 0

Answer:

8 moles

Explanation:

When we are asked to convert from grams of a substance into moles, we have to use the substance's molar mass.

Meaning that for this problem, we'll <em>use the molar mass of hydrogen peroxide</em> (H₂O₂), as follows:

  • 272 g ÷ 34 g/mol = 8 mol

There are 8 moles in 272 grams of hydrogen peroxide.

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At 25°C, the equilibrium constant Kc for the reaction in thesolvent CCl4 2BrCl &lt;----&gt; Br2 + Cl2 is 0.141. If the initial c
ivolga24 [154]

<u>Answer:</u> The equilibrium concentration of bromine gas is 0.00135 M

<u>Explanation:</u>

We are given:

Initial concentration of chlorine gas = 0.0300 M

Initial concentration of bromine monochlorine = 0.0200 M

For the given chemical equation:

                   2BrCl\rightleftharpoons Br_2+Cl_2

<u>Initial:</u>          0.02               0.03

<u>At eqllm:</u>    0.02-2x     x     0.03+x

The expression of K_c for above equation follows:

K_c=\frac{[Br_2]\times [Cl_2]}{[BrCl]^2}

We are given:

K_c=0.141

Putting values in above equation, we get:

0.141=\frac{x\times (0.03+x)}{(0.02-2x)^2}\\\\x=-0.96,+0.00135

Neglecting the value of x = -0.96 because, concentration cannot be negative

So, equilibrium concentration of bromine gas = x = 0.00135 M

Hence, the equilibrium concentration of bromine gas is 0.00135 M

8 0
3 years ago
If you have 250 mL of 0.75 M LINO2.<br> How many grams of this substance<br> would you have?
Vesna [10]

Mass of this substance = 9.928 g

<h3>Further explanation</h3>

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

\boxed{\bold{n=V\times M}}

mol of substance -Lithium nitrite - LiNO₂ :

V = 250 ml = 0.25 L

M = 0.75 M

\tt n=0.25\times 0.75=0.1875

So mass of this substance -  LiNO₂ (MW=52,947 g/mol) :

\tt mass=mol\times MW\\\\mass=0.1875\times 52,947 g/mol\\\\mass=9.928~g

4 0
2 years ago
Which atom attracts electrons most strongly when bonded? oxygen (O) magnesium (Mg)
Vadim26 [7]
Oxygen because it is on the left of the periodic table so it has a strong pull.
8 0
3 years ago
Read 2 more answers
A neutral atom always contains an equal number of
STALIN [3.7K]

Answer: protons and electrons

Explanation: In a neutral atom there are always equal numbers of protons and electrons.

8 0
2 years ago
When 54.50 and 50.407 are divided, how many significant figure would you have?
Anastaziya [24]

Answer:

4 sig figs

Explanation:

<h3>Rule when dividing or multiplying:</h3>

After normally solving the expression cut round the decimal to the least accurate of the two.

54.50/50.407 = 1.08119904

Since 54.50 is the least accurate we will round to the hundredths place.

1.081 is final answer

so there are 4 sig figs.

8 0
2 years ago
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