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2 years ago

1. 3.311 * 10^24 particles=_moles? 2. 126 grams of H2O =________moles of moles? whats the answers

1 answer:

4 0

1. You can use Avogadro’s number, 6.022x10^23 atoms/mole, to answer this one.

(3.311x10^24/6.022x10^23) = 5.498 moles of substance

2. H2O has a formula weight approximately equal to 18 grams. Dividing the given amount by the formula weight of water will tell us the number of moles present.

126/18 = 7 moles H2O

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2 years ago

At 25°C, the equilibrium constant Kc for the reaction in thesolvent CCl4 2BrCl <----> Br2 + Cl2 is 0.141. If the initial c

ivolga24 [154]

Answer: The equilibrium concentration of bromine gas is 0.00135 M

Explanation:

We are given:

Initial concentration of chlorine gas = 0.0300 M

Initial concentration of bromine monochlorine = 0.0200 M

For the given chemical equation:

$2BrCl\rightleftharpoons Br_2+Cl_2$

Initial: 0.02 0.03

At eqllm: 0.02-2x x 0.03+x

The expression of $K_c$ for above equation follows:

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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

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3 years ago

How many molecules are there in 2.30g of NH3

Vinil7 [7]

Answer:

8.13x10^22 molecules

Explanation:

We can use the Avogadro's number(6.022 x 10^23 units / mole)

2.30 g NH3 (1 mol / 17.03 g ) (6.022 x 10^23 molecules / 1 mol ) = 8.13x10^22 molecules

Hope this helps! Feel free to ask any questions!

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2 years ago

The combustion reaction of propane is described by the reaction. c3h8 5o2 → 4h2o 3co2. how many moles of o2 are required to gene

dmitriy555 [2]

C₃H₈ + 5 O₂ → 4 H₂O + 3 CO₂

mole ratio based on balance equation of O₂ : CO₂ i s 5 : 3
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∴ if moles of CO₂ = 3 moles

then moles of O₂ = (3 moles ÷ 3) × 5

= 5 moles

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2 years ago

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The density of Silver is 10.5 g/mL. How much mass would be present given a silver cube

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Answer:

m=dxv

= 10.5 x 965 = 10132.5 rounded off to 10100 g

Explanation:

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2 years ago

1. 3.311 * 10^24 particles=_______________moles? 2. 126 grams of H2O =______________________moles of moles? whats the answers

1. 3.311 * 10^24 particles=_moles? 2. 126 grams of H2O =________moles of moles? whats the answers