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3 years ago

7

If a piece of marble has the mass of 132.796 g and the volume of 26.9 cm

2 answers:

Mashutka [201]3 years ago

8 0

Answer:

4.94g/cm3.

Explanation:

4.94g/cm3.

jek_recluse [69]3 years ago

6 0

Answer:4.93665 g/cm“3“

Explanation: 132.796g times 26.9 equals

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What are the products in a neutralization reaction A. Two elements B.an acid and a base C. An element and a compound D. A salt a

frez [133]

D. Salt and water

Explanation:

Acid + Alkali -> Salt + water

5 0

3 years ago

Read 2 more answers

if the percent by volume is 2% and the volume of solution is 250 mL what is the volume of solute and solution

Liula [17]

Answer:

Solute = 5 mL; solution = 250 mL

Explanation:

The formula for percent by volume is

$\text{Percent by volume} = \dfrac{\text{Volume of solute}}{\text{Volume of solution}}\times 100 \, \%$

If you have 250 mL of a solution that is 2 % v/v,

$\begin{array}{rcl}2 \, \% & = & \dfrac{\text{Volume of solute}}{\text{250 mL}}\times 100 \, \%\\\\2 \times \text{ 250 mL} & = & \text{Volume of solute} \times 100\\\text{Volume of solute} & = & \dfrac{2 \times 250\text{ mL}}{100}\\\\ & = & \textbf{5 mL}\\\end{array}$

If there is no change of volume on mixing,

Volume of solution = 250 mL

-Volume of solute = <u> </u><u>5</u><u> </u>

Volume of solvent = 245 mL

5 0

3 years ago

The diagram above depicts an energy releasing process involving the uranium atom. Which form of energy does this process depict?

mariarad [96]

A nuclear energy is the answer

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3 years ago

A student isolated 15.6 g of product from a chemical reaction. She calculated that the reactions should have produced 18.4 g of

Snezhnost [94]

Answer:

The percent yield of this reaction is 84.8 % (option A is correct)

Explanation:

Step 1: Data given

The student isolated 15.6 grams of the product = the actual yield

She calculated the reaction should have produced 18.4 grams of product = the theoretical yield = 18.4 grams

Step 2: Calculate the percent yield

Percent yield = (actual yield / theoretical yield ) * 100 %

Percent yield = (15.6 grams / 18.4 grams ) * 100 %

Percent yield = 84.8 %

The percent yield of this reaction is 84.8 % (option A is correct)

7 0

3 years ago

Free-energy change, ΔG∘, is related to cell potential, E∘, by the equationΔG∘=−nFE∘where n is the number of moles of electrons t

mart [117]

Answer:

a) $\Delta G=372490 J$

b) $\Delta G=-568614 J$

Explanation:

a) The reaction:

$Mg(s) +Fe^{2+}(aq) \longrightarrow Mg^{2+}(aq) + Fe(s)$

The free-energy expression:

$\Delta G=-n*F*E$

$E=E_{red}-E_{ox]$

The element wich is reduced is the Fe and the one that oxidates is the Mg:

$-0.44V=E_{red}-(-2.37V)=1.93V$

The electrons transfered (n) in this reaction are 2, so:

$\Delta G=-2mol*96500 C/mol * 1.93 V$

$\Delta G=-372490 J$

b) If you have values of enthalpy and enthropy you can calculate the free-energy by:

$\Delta G=\Delta H - T* \Delta S$

with T in Kelvin

$\Delta G=-675 kJ*\frac{1000J}{kJ} - 298K*-357 J/K$

$\Delta G=-568614 J$

7 0

3 years ago