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RoseWind [281]
2 years ago
15

Compare and contrast the Andes Mountains and the Rocky Mountains. How are they formed? What consumers and producers are in each?

.
Chemistry
1 answer:
Naily [24]2 years ago
7 0

Answer:

ummm i need help too lol

Explanation:

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A 0.450 g sample of solid lead(II) nitrate is added to 250 mL of 0.250 M sodium iodide solution. Assume no change in volume of t
Verdich [7]

Pb(NO₃)₂ ⇒limiting reactant

moles PbI₂ = 1.36 x 10⁻³

% yield  = 87.72%

<h3>Further explanation</h3>

Given

Reaction(unbalanced)

Pb(NO₃)₂(s) + NaI(aq) → PbI₂(s) + NaNO₃(aq)

Required

  • moles of PbI₂
  • Limiting reactant
  • % yield

Solution

Balanced equation :

Pb(NO₃)₂(s) + 2NaI(aq) → PbI₂(s) + 2NaNO₃(aq)

mol Pb(NO₃)₂ :

= 0.45 : 331 g/mol

= 1.36 x 10⁻³

mol NaI :

= 250 ml x 0.25 M

= 0.0625

Limiting reactant (mol : coefficient)

Pb(NO₃)₂ : 1.36 x 10⁻³ : 1 = 1.36 x 10⁻³

NaI : 0.0625 : 2 = 0.03125

Pb(NO₃)₂ ⇒limiting reactant(smaller ratio)

moles PbI₂ = moles Pb(NO₃)₂ = 1.36 x 10⁻³(mol ratio 1 : 1)

Mass of PbI₂ :

= mol x MW

=  1.36 x 10⁻³ x 461,01 g/mol

= 0.627 g

% yield = 0.55/0.627 x 100% = 87.72%

7 0
3 years ago
Which of the items below could scientists use to date a layer of rock?
Grace [21]
A fossilized fish could be used to identify the date of of the rock layer.
4 0
3 years ago
1. What is the difference between science and pseudoscience?
n200080 [17]
Science is a body of knowledge and process of gaining new knowledge, It is also falsifiable.

Pseudoscience does not follow the scientific process. And it is also unfalsifiable.
3 0
3 years ago
ASAP ILL GIVE BRAINLIEST ! IF YOU CAN ANSWER AT LEAST ONE TY
lesantik [10]

Answer:

Project shadow #KARMA be there

Explanation:

3 0
3 years ago
On the celsius scale, at what temperature does water boil?
Gnom [1K]
Simple....

On the celsius scale, at what temperature does water boil? 

---->>>

D.)100

Thus, your answer.

6 0
3 years ago
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