3 years ago

Which of the following is true about technology and science

Chemistry

1 answer:

galben [10]3 years ago

4 0

Answer:

car

Explanation:

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How much heat is required to melt 20 g of gold at 1064.18 °C with a heat of fusion of 64 J/g *

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Answer:

1280J are required.

Explanation:

Heat of fusion is defined as the amount of heat required to change its state from liquid to solid at its melting point at constant pressure.

As heat of fusion of gold is 64J/g, there are required 64J to melt 1g of gold at its melting point. The energy required to melt 20g is:

20g * (64J/g) =

1280J are required

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Consider the gas-phase equilibrium A ? B. In a series of experiments, different initial amounts of A and B are mixed together, a

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3 years ago

Which of the following would be useful to show the growth rate of plants at varying temperatures? A. circle graph B. bar graph C

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The density of copper is 8.9 g/mL. What is the volume of 20.5 g copper?

love history [14]

Answer:

density = 8.9 g/ml

m = 20.5 g

V = ... ?

density = m/V

V = m / density

= 20.5 / 8.9

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3 years ago

`You have to be careful about pouring drano down your pipes since it is mainly hydrochloric acid--you can't do it if they are ma

Zanzabum

Answer:

6.67 moles

Explanation:

Given that:-

Moles of hydrogen gas produced = 10.0 moles

According the reaction shown below:-

$2Al + 6HCl\rightarrow 2AlCl_3 +3H_2$

3 moles of hydrogen gas are produced when 2 moles of aluminium undergoes reaction.

Also,

1 mole of hydrogen gas are produced when $\frac{2}{3}$ moles of aluminium undergoes reaction.

So,

10.0 moles of hydrogen gas are produced when $\frac{2}{3}\times 10.0$ moles of aluminium undergoes reaction.

<u>Moles of Al needed = $\frac{2}{3}\times 10.0$ moles = 6.67 moles</u>

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3 years ago