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3 years ago

14

How many molecules are in 4.62 moles of nitric acid (HNO3)?

1 answer:

Lena [83]3 years ago

6 0

Answer:

2.8x10^24

Explanation:

To convert moles to molecules, multiply the number of moles by Avagadro's number (6.02x10^23. Round if required.

4.62mol × 6.02x10^23 = 2.8x10^24

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Which of the following statements is true regarding bacteria and animal cells?

Fantom [35]

The most accurate answer is A.

Bacterial cells are generally very small, almost 10 times smaller than most animal and plant cells. Most bacterial cells measure about 0.2 to 10 microns or micrometers which in inches is 0.0000079 to 0.00039.

One of the reasons that bacterial cells are so small is that they require a large surface area to volume ratio to be able to take in nutrients. They take in nutrients from their surroundings through the process of diffusion.

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3 years ago

if, on average a person drinks eight glasses of water each day, and each glass contains 300 mL. a. how many liters of water will

yulyashka [42]

A.)

300 ml * 8 = 2.4 gallons a day.

now time to see how much a year..

2.4 * 365 = 876 liters

B.)

one liter = 2.2 pounds

876 x 2.2 = 1927.2 pounds

Answers:

<u>A.) 2.4 * 365 = 876 liters</u>

<u>B.) 876 x 2.2 = 1927.2 pounds</u>

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2 years ago

Which of the following is NOT a factor that determines how much energy we need?

german

Answer:

B) The amount of vitamin D gained in 1 day.

Explanation:

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2 years ago

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Match the following associations. Exothermic or endothermic

Alekssandra [29.7K]

<u>Answer:</u>

<em>1) ∆H is positive $\Rightarrow$ Endothermic </em>

<em>2) $E_p>E_r$ $\Rightarrow$ Endothermic </em>

<em>3) Energy is absorbed $\Rightarrow$ Endothermic </em>

<em>4) $E_r>E_p$ $\Rightarrow$ Exothermic </em>

<em>5) ∆H is negtive $\Rightarrow$ Exothermic </em>

<em></em>

<u>Explanation:</u>

∆H is called as enthalpy change

It is also called as Heat of reaction

Energy is required for the bond to break a bond.

Energy is released when a bond is formed.

$H_2+Cl_2>2HCl$

that is

$H-H+Cl-Cl>2H-Cl$

We see in this equation, bonds between hydrogen and chlorine molecules gets broken and on the right side bond is formed in HCl.

If energy of products greater than energy of reactants then the reaction enthalpy change is endothermic .

If energy of products lesser than energy of reactants then the reaction enthalpy change is exothermic .

For example

$\Delta H=E_p-E_r$

$=30KJ-20KJ$

$=+10KJ$

(positive hence endothermic)

$\Delta H=E_p-E_r$

$=10KJ-40KJ$

$=-30KJ$

(negative hence exothermic)

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