3 years ago

AN object has a volume of 77ml and a mass of 429. What is the density of this object?

Chemistry

1 answer:

pantera1 [17]3 years ago

6 0

Answer:

4.254320865115cm or simplied 4.25cm

Explanation:

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3 years ago

If you have 250 mL of 0.75 M LINO2.<br> How many grams of this substance<br> would you have?

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<h3>Further explanation</h3>

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

$\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}$

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

$\boxed{\bold{n=V\times M}}$

mol of substance -Lithium nitrite - LiNO₂ :

V = 250 ml = 0.25 L

M = 0.75 M

$\tt n=0.25\times 0.75=0.1875$

So mass of this substance - LiNO₂ (MW=52,947 g/mol) :

$\tt mass=mol\times MW\\\\mass=0.1875\times 52,947 g/mol\\\\mass=9.928~g$

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2 years ago

A 1,350-Kg car travels at 12 <br> M/s. What is its kinetic energy??

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The kinetic energy of the car will be 97.2.

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