All categories

3 years ago

What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm3.

Chemistry

1 answer:

Y_Kistochka [10]3 years ago

7 0

Mass will be 172.8 gram only

You might be interested in

Which has a higher kinetic energy an object at 20° C or an object at 50°C

Simora [160]

Answer:

The object at 50°C will have a higher kinetic energy.

Explanation:

Temperature is a measure of the average kinetic energy of the particles in an object. As you introduce more energy into the system (e.g. heat the object), the particles on average move faster because they have more kinetic energy.

5 0

3 years ago

How many grams of oxygen are needed to react with excess methane in the following reaction, in order to produce 325 kJ of energy

Sergio [31]

~移動NDISとJSが可いままでも今のところ天の

6 0

3 years ago

one molecule of chlorophyll contains 137 atoms. how many of these atoms come from the metal magnesium?

Svetlanka [38]

The chemical formula for chlorophyll is C55H72O5N4Mg. Only 1 of the 137 atoms comes from magnesium.

7 0

3 years ago

What is the same for all of the drilling sites we examined?

yarga [219]

Answer:

the same is what is this question like what did u exame

4 0

3 years ago

Read 2 more answers

Hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer indu

ddd [48]

Answer: The amount of heat released is 56 MJ.

Explanation:

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

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

Given mass of $C_2H_6$ = 12 kg = 12000 g (Conversion factor: 1 kg = 1000 g)

Molar mass of $C_2H_6$ = 30 g/mol

Putting values in above equation, we get:

$\text{Moles of }C_2H_6=\frac{12000g}{30g/mol}=400mol$

The chemical reaction for hydrogenation of ethene follows the equation:

$C_2H_4+H_2\rightarrow C_2H_6$

By Stoichiometry of the reaction:

When 1 mole of ethane releases 140 kJ of heat.

So, 400 moles of ethane will release = $\frac{140}{1}\times 400=56000kJ$ of heat.

Converting this into Mega joules, using the conversion factor:

1 MJ = 1000 kJ

So, $\Rightarrow 56000kJ\times (\frac{1MJ}{1000kJ})=56MJ$

Hence, the amount of heat released is 56 MJ.

8 0

3 years ago