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Jlenok [28]
3 years ago
9

How many moles of ca(oh)2 are in 25ml of 1.5 M solution?

Chemistry
1 answer:
Klio2033 [76]3 years ago
6 0
Molar concentration is

C=\frac{\eta}{V}

[V]=Liters

[\eta]=mol

\eta=C*V

V=25~mL=0.025~L

\eta=1.5*0.025

\boxed{\boxed{\eta=0.0375~moles}}
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. Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9.
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4 0
3 years ago
How many moles make up 5.7491x1025 molecules of Dinitrogen pentoxide (N2O5)?
pav-90 [236]

Answer:

<h2>95.5 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{5.7491 \times  {10}^{25} }{6.02 \times  {10}^{23} }  \\

We have the final answer as

<h3>95.5 moles to 3 sig. figures</h3>

Hope this helps you

6 0
3 years ago
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