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The amount by which a machine multiplies an effort force is called ____.

blagie [28]

C. mechanical advantage

3 0

3 years ago

Cryolite (Na3AlF6) is used in the production of aluminum from its ores. It is made by the reaction 6 NaOH 1 Al2O3 1 12 HF 8n 2 N

kap26 [50]

Answer: The mass of cryolite produced in the reaction is 1181.8 g

Explanation:

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

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of aluminium oxide = 287 g

Molar mass of aluminium oxide = 102 g/mol

Putting values in equation 1, we get:

$\text{Moles of aluminium oxide}=\frac{287g}{102g/mol}=2.814mol$

The given chemical reaction follows:

$6NaOH+Al_2O_3+12HF\rightarrow 2Na_3AlF_6+9H_2O$

By Stoichiometry of the reaction:

1 mole of aluminium oxide produces 2 moles of cryolite

So, 2.814 moles of aluminium oxide will produce = $\frac{2}{1}\times 2.814=5.628mol$ of cryolite

Now, calculating the mass of cryolite by using equation 1:

Moles of cryolite = 5.628 moles

Molar mass of cryolite = 210 g/mol

Putting values in equation 1, we get:

$5.628mol=\frac{\text{Mass of cryolite}}{210g/mol}\\\\\text{Mass of cryolite}=(5.628mol\times 210g/mol)=1181.8g$

Hence, the mass of cryolite produced in the reaction is 1181.8 g

5 0

3 years ago

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater t

Vinil7 [7]

Answer:

the heat source must be greater than 100°C

the water must be permitted to evaporate quickly

the system must be sealed and become pressurized above atmospheric pressure

the vapor pressure must be kept below 760 mmHg

Explanation:

A superheated water is a dry form of steam in which hydrogen bonds that strongly binds the molecules of water has been overcome.

Superheated water finds application in a wide range of places. For example they are used for sterilization of clinical equipment.

To produce steam or superheated water, the temperature of the source must be greater than the boiling temperature and less than the critical temperature at 374°C.
Since superheated water is steam and steam is water in gaseous form. The water must be made to evaporate more quickly than it should condense back.
High pressure and sealing the system helps to produce superheated water very fast.
If the pressure between the vapor is kept low, water will boil faster.

8 0

3 years ago

When .455g of anthracene, c14h10, is combusted in a bomb calorimeter that has a water jacket containing 500 g of water, the temp

-BARSIC- [3]

Answer: Q = 500.0 x 4.18 x 8.63 = 18037 J => 18.037 kJ moles anthracene = 0.455 g/ 178.234 g/mol=0.00255 0.00255 moles give 18.037 kJ 0.00255 : 18.037 = 1 mole : x x = 7073 kJ/mol enthalpy = - 70.73 kJ/mol

6 0

3 years ago

Read 2 more answers

4. Which of the following describes a hydrogen bond? *

victus00 [196]

Answer:

b or d I think sorry if it is wrong

4 0

3 years ago

Read 2 more answers

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