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3 years ago

What is the mass of the helium nucleus?

Chemistry

1 answer:

emmasim [6.3K]3 years ago

3 0

The mass of the helium nucleus is 6.64 x 10^-27 kilograms

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What color or colors of light are transmitted by a piece of yellow glass?

Artyom0805 [142]

Answer:

So combining blue with yellow light is like combining blue light with red and green light. The result of combining these three primary colors of light is to produce white light.

Explanation:

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3 years ago

Which of the following statements describes sound energy?

Galina-37 [17]

Answer:

Explanation:

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2 years ago

Find errors in this equation. Ca(s) + water(l) -> C(OH)2 (aq) + H(6)

vladimir1956 [14]

Calcium (s) + h2o (i) -> carbon(oh)2 (AQ) +h(6)
well aq isnt a element.

4 0

3 years ago

Which combination is the best choice to prepare a buffer with a ph of 5.0? which combination is the best choice to prepare a buf

klio [65]

Answer:

The best combination is C5H5N; C5H5NHCl (pKb for C5H5N is 8.76)

Explanation:

Step 1: Data given

pH of a buffer = pKa + log ([A-]/[HA])

pH of a buffer = pKb + log ([B+]/[BOH])

Step 2

hcho2; nacho2 (pka for hcho2 is 3.74)

⇒ HCHO2 = CH2O2 = formic acid = a weak acid

⇒ NaCHO2

⇒ pKa = 3.74

pH = 3.74 + log [HCOO-] / [HCOOH]

When the amount of HCHO2 and NaCHO2 is the same, the pH is 3.74

c5h5n; c5h5nhcl (pkb for c5h5n is 8.76)

⇒ C5H5N = base

⇒ C5H5NH+ = conjugate acid

⇒ pKb = 8.76

pOH = pKb + log [conjugate acid]/[weak base]

pOH = 8.76 + log [C5H5NH+]/[C5H5N]

When the amount of C5H5N and C5H5NCl is the same, pOH is 8.76

pH = 14 - 8.76 = 5.24

nh3; nh4cl (pkb for nh3 is 4.75)

⇒ NH3 = base

⇒ NH4+ = conjugate acid

⇒ pKb = 4.75

pOH = 4.75 + log [NH4+]/[NH3]

When the amount of NH4Cl and NH3 is the same, pOH is 4.75

pH = 14 - 4.75 = 9.25

hno2;nano2 (pka for hno2 is 3.33)?

⇒ HNO2 = a weak acid

⇒ NO2-

⇒ pKa = 3.33

pH = 3.33 + log [NO2-] / [HNO2]

When the amount of both is the same, the pH will be 3.33

The best combination is C5H5N; C5H5NHCl (pKb for C5H5N is 8.76)

7 0

3 years ago

A container has a volume of 5.43 L and a pressure of 7.97 atm. If the pressure changes to 2.32

Novosadov [1.4K]

<h3>Answer:</h3>

18.65 L

<h3>Explanation:</h3>

We are given;

Initial volume of the container, V1 as 5.43 L
Initial pressure of the container, P1 as 7.97 atm
New pressure, P2 is 2.32 atm

We are required to calculate the container's new volume;

We are going to use Boyle's law

According to Boyle's law the volume of a fixed mass of a gas and the pressure are inversely proportional at a constant absolute temperature.
That is; $P\alpha \frac{1}{V}$

At varying pressure and volume at constant temperature, k is the constant.
Therefore; $P1V1=P2V2$

Rearranging the formula;

$V2=\frac{P1V1}{P2}$

$V2=\frac{(7.97atm)(5.43L)}{2.32atm}$

$V2=18.654$

Therefore, the new volume will be 18.65 L

3 0

3 years ago