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3 years ago

Please please help me please please help please please help me please please help please please

Chemistry

1 answer:

Tatiana [17]3 years ago

6 0

Answer:

AU9NJ-BLVHV-TCLJS-54YTB

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How many atoms are in 0.750 moles of zinc?

ollegr [7]

Best Answer: 4.52 X 10²³ atoms. Use Avogadro's number to multiply 0.750 moles times 6.022 X 10²³

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3 years ago

The vapor pressure of a substance describes how readily molecules at the surface of the substance enter the gaseous phase. At th

geniusboy [140]

Answer:

84.75°C is the boiling point of water at an elevation of 7000 meter.

Explanation:

Rate of change of pressure = 19.8 mmHg/1000 ft

1 foot = $\frac{1}{3.28}$ meter

$19.8 mmHg/1000 ft=\frac{19.8}{1000}\times 3.28 mmHg/m=0.065 mmHg$

Pressure change for every 1 m = 0.065 mmHg × 1= 0.065 mmHg

Elevation Pressure

0 m 760 mmHg

1000 m 695 mmHg

2000 m 630 mmHg

Pressure drop at the elevation of 7000 m: $7000\times 0.065 mmHg=455 mmHg$

Pressure at 7000 m = 760 mmHg - 455mmHg = 305 mmHg

The boiling point of water decreases 0.05°C for every 1 mmHg drop in atmospheric pressure.

At 7000 meter elevation the boiling of water will be :

$0.05^oC\times 305=15.25^oC$

Boiling point of water at 7000 meter elevation :

$100.0^oC-15.25^oC =84.75^oC$

84.75°C is the boiling point of water at an elevation of 7000 meter.

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4 years ago

How is the law of conservation of mass applied to<br> ecology?

zmey [24]

Answer:

The Law of Conservation of Mass tells us that matter is neither created nor destroyed during a chemical reaction. ... The Law of Conservation of Mass applies as the total mass of the products is equal to the total mass of the reactants.

Explanation:

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3 years ago

Read 2 more answers

What is another name for a chemical change? A. chemical spill B. physical change C. physical property D. chemical reaction

Elenna [48]

The correct answer is D. chemical reaction.

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4 years ago

Which of the following is a chemical property of a sheet of paper?

Tomtit [17]

Answer:

Explanation:

Flammability is a chemical property. The paper crumbling would be a physical property. The inability to attract a magnet or conduct electricity would be considered electrical properties

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3 years ago