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4 years ago

11

Aluminum oxide was prepared by heating 225 g of chromium (III) oxide with 125 g of aluminum. Calculate the percent yield of 100.

0 g of aluminum oxide were obtained

1 answer:

Veronika [31]4 years ago

4 0

Answer:

66.25%

Explanation:

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A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg

Brut [27]

Answer: $1.0\times 10^2g$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-6.4-(13.6))^0C=7.2^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte like urea)

$K_f$ = freezing point constant = $3.96^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

$7.2=1\times 3.96\times \frac{xg}{60.06 g/mol\times 0.95kg}$

$x=1.0\times 10^2g$

Thus $1.0\times 10^2g$ urea was dissolved.

8 0

4 years ago

Beginning with commercial grade hydrochloric acid, 1.00 • 10^2 mL of a 12.4 M HCl is added to water to bring the total volume if

MatroZZZ [7]

Concentration=mass/volume.

This should help.

3 0

3 years ago

A block of iron has a mass of 826 g. What is the volume of the block of iron whose density at 25°C is 7.9 ?

kolezko [41]

Answer:

104.56cm³

Explanation:

Mass=826g

Density =7.9g/cm³

Volume =Mass /Density

Volume =826/7.9

Volume =104.56cm³

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2 years ago

What type of reaction is shown below? <br> Ca + 2H2O - Ca(OH)2 + H2

krek1111 [17]

A + BC ---> AB + C
So here one reactant (A) is accepting a group which is being given by another compound (BC) however the A is not giving any group / element or ion
So this single displacement
Similarly in the given reaction
the anion OH- is only being replaced
The element Ca accepts OH- and H2O loses the same group to form new element H2
So the correct answer is
Single replacement also known as single displacement.

5 0

3 years ago

A student mixed two chemicals to allow them to

Westkost [7]

Answer:

B .it is an exothermic reaction

Explanation:

i need brainleyest

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2 years ago