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3 years ago

How many moles are in 1.51 x 10^26 atoms of xenon? will mark brainlyest

Chemistry

1 answer:

zhuklara [117]3 years ago

7 0

0.94Answer:

Explanation:

TO find the number of moles in a substance given its number of

entities we use the formela

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A chemical engineer determines the mass percent of iron in an ore sample by converting the Fe to Fe²⁺ in acid and then titrating

neonofarm [45]

The mass percent of iron in the ore is 31.6%

<h3>Steps</h3>

8H⁺(aq) + 5Fe²⁺(aq) + MnO⁻₄(aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(l)

V(MnO4^-)=39,32 mL

c(MnO4^-)=0,0319M

n(MnO4^-)=c*V=1,254308 mmol

n(Fe^{2+})=5*n(MnO4^-)=6,27 mmol

Equation

Fe+2H->Fe^+2 + H2

n(Fe)=n(Fe^{2+} )=6,27 mmol

m(Fe)=n*Ar=350,27mg=0,35027g

mass percent(Fe in ore)=m(Fe)/m(ore)*100

=31,61 percent

The mass percent of iron in the ore is 31.6%

<h3>What is the equation for the balance formula?</h3>

An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have an equal balance of mass and charge.

<h3>An illustration of a balanced equation</h3>

For instance, consider about the reaction: O2 (g) + 2Mg(s) = 2MgO (g) Two magnesium and two oxygen atoms are present in this reaction on both the reactant and product sides.

learn more about balanced equation here

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1 year ago

Create a time that marks important events during the Precambrian Supereon.

Maurinko [17]

I really hope this help!!

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3 years ago

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The Heliocentric model is when the sun, planets, and stars are orbiting a stationary Earth.

Anarel [89]

False

A heliocentric is when the model is
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3 years ago

If 10.0 mL of a .600 M of HNO3 reacts with 31.0 mL of .700M Ba(OH)2 solution, what is the molarity of Ba(OH)2 after the reaction

Tasya [4]

Answer:

<u></u>

<u>0.456M</u>

Explanation:

<u>1. Balanced molecular equation</u>

$2HNO_3+Ba(OH)_2\rightarrow Ba(NO_3)_2+2H_2O$

<u>2. Mole ratio</u>

$\dfrac{2molHNO_3}{1molBa(OH)_2}$

<u>3. Moles of HNO₃</u>

Number of moles = Molarity × Volume in liters
n = 0.600M × 0.0100 liter = 0.00600 mol HNO₃

<u>4. Moles Ba(OH)₂</u>

n = 0.700M × 0.0310 liter = 0.0217 mol

<u>5. Limiting reactant</u>

Actual ratio:

$\dfrac{0.0600molHNO_3}{0.0217molBa(OH)_2}\approx0.28$

Since the ratio of the moles of HNO₃ available to the moles of Ba(OH)₂ available is less than the theoretical mole ratio, HNO₃ is the limiting reactant.

Thus, 0.006 moles of HNO₃ will react completely with 0.003 moles of Ba(OH)₂ and 0.0217 - 0.003 = 0.0187 moles will be left over.

<u>6. Final molarity of Ba(OH)₂</u>

Molarity = number of moles / volume in liters
Molarity = 0.0187 mol / (0.0100 + 0.0031) liter = 0.456M

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3 years ago

Question 7 (2 points)<br> A mocktail is a flavoured cocktail.<br> O True<br> O False

RoseWind [281]

False a mock tail is a cocktail with the liquor.

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2 years ago

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