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Natasha2012 [34]
3 years ago
10

Calculate the number of moles in 456 g of lead, Pb

Chemistry
1 answer:
Vlad [161]3 years ago
3 0

Answer:

Number of moles = 2.2 mol

Explanation:

Given data:

Number of moles of lead = ?

Mass of lead = 456 g

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass of lead = 207.1 g/mol

Now we will put the values in formula:

Number of moles = 456 g/ 207.1 g/mol

Number of moles = 2.2 mol

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Veronika [31]

Answer:

A. 2

hope this helps :)

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3 0
3 years ago
Can some body plz help correct me or correct the true or false answers I did wrong. I’m not sure there right :(
3241004551 [841]

4 3 and 5 are wrong:)

4 is true and 5 is false

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8 0
3 years ago
true or false The atoms in Container A are hydrogen atoms. Hydrogen is a gas. The atoms placed in containers E, F, G, and H will
sleet_krkn [62]

Answer:

False

Explanation:

7 0
3 years ago
Consider the reaction: <img src="https://tex.z-dn.net/?f=NiO%28s%29%2BCO%28g%29%20%5Crightleftharpoons%20Ni%28s%29%2BCO_2%28g%29
sasho [114]

Answer:

Molar concentration of CO₂ in equilibrium is 0.17996M

Explanation:

Based on the reaction:

NiO(s) + CO(g) ⇆ Ni(s) + CO₂(g)

kc is defined as:

kc = [CO₂] / [CO] = 4.0x10³ <em>(1)</em>

As initial concentration of CO is 0.18M, the concentrations in equilibrium are:

[CO] = 0.18000M - x

[CO₂] = x

Replacing in (1):

4.0x10³ = x / (0.18000-x)

720 - 4000x = x

720 = 4001x

x = 0.17996

Thus, concentrations in equilibrium are:

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[CO₂] = x = <em>0.17996M</em>

<em></em>

Thus, <em>molar concentration of CO₂ in equilibrium is 0.17996M</em>

<em />

I hope it helps!

5 0
3 years ago
el diametro de la tierra en el ecuador es de 7926381 ml. redondee este numero a tres cifras significativas y expresel en notcion
elena55 [62]

7.93 x 10⁶mi

Explanation:

Significant figures are numbers that shows how accurate and precise scientific measurements are reported.

Here are some rules to identifying them;

  • All non-zero digits are significant
  • zeros between digits are significant
  • leading zero before a decimal are not significant
  • trailing zero after a decimal are significant
  • trailing zero before a decimal point are significant.

The number 7926381  has 7 significant numbers.

To write in the scientific notation, we simply express as N x 10ᵃ

   N is the number of significant number

   a is the exponent

N here is 7.93

a here is 6

            7.93 x 10⁶mi

learn more:

Significant figures brainly.com/question/2746374

#learnwithBrainly

7 0
3 years ago
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