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3 years ago

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Aqueos hydrogen peroxide (H2O2) decomposes into liquid water and oxygen gas. how many moles of water will be produced from 2.5 m

oles of hydrogen peroxide(H2O2)?

1 answer:

Ilya [14]3 years ago

3 0

2.5 because 2h2o2 give rise to 2 h2o

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What's the molar mass of Cr(Cr2O7)3

MariettaO [177]

<h3>Answer:</h3>

700 g/mol

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

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<h3>Explanation:</h3>

<u>Step 1: Define</u>

Cr(Cr₂O₇)₃

<u>Step 2: Identify</u>

Molar Mass of Cr - 52.00 g/mol

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Molar Mass of Cr(Cr₂O₇)₃ - 52.00 + 6(52.00) + 21(16.00) = 700 g/mol

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3 years ago

What would happen if the earths core cooled

maria [59]

Answer:

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Explanation:

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3 years ago

If 354.2g PbCl2 are reacted with excess Na3PO4, how many grams of NaCl will be produced

Illusion [34]

Answer: The mass of $NaCl$ produced is, 149 grams.

Explanation : Given,

Mass of $PbCl_2$ = 354.2 g

Molar mass of $PbCl_2$ = 278 g/mol

Molar mass of $NaCl$ = 58.5 g/mol

First we have to calculate the moles of $PbCl_2$

$\text{Moles of }PbCl_2=\frac{\text{Given mass }PbCl_2}{\text{Molar mass }PbCl_2}$

$\text{Moles of }PbCl_2=\frac{354.2g}{278g/mol}=1.27mol$

Now we have to calculate the moles of $CaCl_2$

The balanced chemical equation is:

$3PbCl_2+2Na_3PO_4\rightarrow 6NaCl+Pb_3(PO_4)_2$

From the reaction, we conclude that

As, 3 moles of $PbCl_2$ react to give 6 mole of $NaCl$

So, 1.27 moles of $PbCl_2$ react to give $\frac{6}{3}\times 1.27=2.54$ mole of $NaCl$

Now we have to calculate the mass of $NaCl$

$\text{ Mass of }NaCl=\text{ Moles of }NaCl\times \text{ Molar mass of }NaCl$

$\text{ Mass of }NaCl=(2.54moles)\times (58.5g/mole)=148.59g\approx 149g$

Therefore, the mass of $NaCl$ produced is, 149 grams.

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3 years ago

Who is considered the father of atomic theory?

Sati [7]

John Dalton is considered the father of the atomic theory. In 1800s he had came up with 5 concepts regarding the atomic theory.

Hope I helped.

4 0

4 years ago

Read 2 more answers

Osmosis occurs when two solutions of different concentrations are separated by a semipermeable membrane. The membrane allows sol

Finger [1]

Answer:

Part A → 7.82 atm

Part B → The unknown solution had the higher concentration

Part C → 0.83 mol/L

Explanation:

Part A

Osmotic pressure (π) = M . R. T . i

NaCl → Na⁺ + Cl⁻ (i =2)

0.923 g of NaCl must be dissolved in 100 mL of solution.

0.923 g / 58.45 g/m = 0.016 moles

Molarity is mol/L → 0.016 m / 0.1L = 0.16M

π = 0.16M . 0.08206 L.atm/molK . 298K . 2 ⇒ 7.82atm

Part. B

The solvent moves toward the solution of higher concentration (to dilute it) until the two solutions have the same concentration, or until gravity overtakes the osmotic pressure, Π. If the level of the unknown solution drops when it was connected to solution in part A, we can be sure that had a higher concentration.

Part. C

π = M . R . T

20.1 atm = M . 0.08206 L.atm/mol.K . 294K

20.1 atm / (0.08206 L.atm/mol.K . 294K) = 0.83 mol/L

8 0

3 years ago