What is number 2? the brain stem......

Chemistry

1 answer:

trasher [3.6K]3 years ago

3 0

The brainstem is an evolutionary ancient part of the brain and is sometimes called the ' reptilian brain' as it provides the basic bodily control in reptiles and other non-mammals.

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How many atoms are in 6.28 moles of aluminum

tensa zangetsu [6.8K]

Answer:

3.78 x 10^24

Explanation:

I mol = 6.02X10^23 atoms

So,

$6.28 mol A l \frac{6.022 x 10^{23}}{1 mol} = 3.78 x 10^{24}$ I did not round the last number

the full answer was, 3.78056 x 10^24

4 0

3 years ago

How many molecules are contained in 0.254 moles of diarsenic trioxide

SIZIF [17.4K]

Answer:

1.53 × 10²³ molecules As₂O₃

Explanation:

Step 1: Define

Diarsenic Trioxide - As₂O₃

Avagadro's number: 6.02 × 10²³ atoms, molecules, formula units, etc.

Step 2: Use Dimensional Analysis

$0.254 \hspace{3} mol \hspace{3} As_2O_3(\frac{6.02(10)^{23} \hspace{3} molecules \hspace{3} As_2O_3}{1 \hspace{3} mol \hspace{3} As_2O_3} )$ = 1.52908 × 10²³ molecules As₂O₃

Step 3: Simplify

We have 3 sig figs.

1.52908 × 10²³ molecules As₂O₃ ≈ 1.53 × 10²³ molecules As₂O₃

4 0

4 years ago

How many moles are in 23.8 g of sulfur dioxide

Yuki888 [10]

Answer:

0.371

Explanation:

number of moles = mass / Ar

= 23.8g / 32.1 + (16.0 × 2)

= 0.37129485179 = 0.371 (3 s.f).

hope it helps :)

4 0

2 years ago

Four gases were combined in a gas cylinder with these partial pressures: 3. 5 atm N2, 2. 8 atm O2, 0. 25 atm Ar, and 0. 15 atm H

aksik [14]

The total pressure of the gas has been 11.9 atm.

The partial pressure has been the pressure exerted by the individual gas in the mixture.

According to the Dalton's law of Partial pressure, the pressure of the gas has been the sum of the partial pressure of each gas in the mixture.

<h3 /><h3>Computation for the pressure of gas</h3>

The given gas has partial pressure of Nitrogen, $P_{N_2}=3.5\;\rm atm$