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3 years ago

How is energy transferred to or from an object if the kinetic energy changes

Chemistry

1 answer:

coldgirl [10]3 years ago

7 0

Typically kinetic energy changes is passed through objects when it crashes

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A solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the

enyata [817]

<u>Answer:</u> The molarity of NaOH solution is 0.273 M.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of KHP = 1.794 g

Molar mass of KHP = 204.2 g/mol

Putting values in above equation, we get:

$\text{Moles of KHP}=\frac{1.794g}{204.2g/mol}=0.0088mol$

The chemical reaction for the reaction of KHP and NaOH follows

$KHC_8H_4O_4(aq.)+NaOH\rightarrow KNaC_8H_4O_4(aq.)+H_2O(l)$

By Stoichiometry of the reaction:

1 mole of KHP reacts with 1 mole of NaOH.

So, 0.0088 moles of KHP will react with = $\frac{1}{1}\times 0.0088=0.0088mol$ of NaOH

To calculate the molarity of NaOH, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

We are given:

Moles of NaOH = 0.0088 moles

Volume of solution = [32.47 - 0.23] mL = 32.24 mL = 0.03224 L (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$\text{Molarity of NaOH }=\frac{0.0088mol}{0.03224L}=0.273M$

Hence, the molarity of NaOH solution is 0.273 M.

3 0

3 years ago

How many moles would contain 1.50 x 1024 atoms of sodium?

riadik2000 [5.3K]

<h3>Answer:</h3>

2.5 moles

<h3>Explanation:</h3>

<u>We are given;</u>

1.5 × 10^24 atoms

We are required to determine the number of moles of sodium.

We know that, 1 mole of an element contains a number of atoms equivalent to the Avogadro's number, 6.022 × 10^23.
That is, 1 mole of an element = 6.022 × 10^23 atoms.

Therefore;

1 mole of sodium contains 6.022 × 10^23 atoms

To get the number of moles;

= Number of atoms ÷ Avogadro's number

= 1.5 × 10^24 atoms ÷ 6.022 × 10^23 atoms/mol

= 2.49 moles

= 2.5 moles

Therefore, 2.5 moles of sodium contains 1.50 × 10^24 sodium atoms

5 0

3 years ago

Ned help with this question

tia_tia [17]

Answer:

135.6

Explanation:

12 * 11.3 = 135.6

To find the mass you have to multiply the density and volume together

If you already have the mass you divide the mass by either the density or volume

8 0

3 years ago

Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?

Alex73 [517]

Your answer is B.
Because it says that that carbon burns in presence of oxygen (C+O) which is equal ( => ) to Carbon Dioxide ( $CO_{2}$ )

3 0

4 years ago

Read 2 more answers

Solid Al(NO3)3 is added to distilled water to produce a solution in which the concentration on nitrate, [NO3^-], is 0.10 M. What

VikaD [51]

Answer:

The concentration of nitrate ion $NO_{3}^{-}$ is 0.033 M.

Explanation:

$Al(NO_{3})_{3} \rightarrow Al^{3+} + NO_{3}^{-}$

1 mole of $[Al^{3+}]$ = 3 mole $NO_{3}^{-}$

Let $[NO_{3}^{-}]$ = 3y

then according to above reaction,

$[Al^{3+}]$ = y

$[NO_{3}^{-}]$ = 0.10 M (given)

$[Al^{3+}]$ = ?

3y = 0.10 M

$y = \frac{0.1}{3}$

y = 0.033 M

So ,concentration of $[Al^{3+}]$ = y = 0.033 M

5 0

3 years ago