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2 years ago

7

Please help me vote you brainiest or whatever it’s called but please help me

1 answer:

Marrrta [24]2 years ago

6 0

Answer:

the penny would move in the direction opposite to the direction of the arrow .

The third law states that every action requires an equal and opposite reaction

So just like we move back when a car suddenly moves forward while we are in a car , the same happens with the penny and card

2) As stated above, Newtons 3rd law is being represented

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A chemist prepares a solution of barium acetate by measuring out of barium acetate into a volumetric flask and filling the flask

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The given question is incomplete. The complete question is :

A chemist prepares a solution of barium acetate by measuring out 32 g of barium acetate into a 350 ml volumetric flask and filling the flask to the mark with water. Calculate the concentration in of the chemist's barium acetate solution. Round your answer to significant digits.

Answer: The concentration of barium acetate solution is 0.375 mol/L

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

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n = moles of solute

$V_s$ = volume of solution in ml

moles of $Ba(CH_3COO)_2$ = $\frac{\text {given mass}}{\text {Molar mass}}=\frac{32g}{255g/mol}=0.125mol$

Now put all the given values in the formula of molality, we get

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$Molarity=0.357M$

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2 years ago