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denis23 [38]
3 years ago
13

Please help asap!!!!! DNA's diameter is 0.000000002 meters. What is this measurement in scientific notation?

Chemistry
1 answer:
frozen [14]3 years ago
5 0
Is 2.0 x 10 to the -9th power an option
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Regular treatment with low dose aspirin is used to help prevent cardiovascular disease. How many aspirin molecules are in
gogolik [260]

The number of molecules of aspirin is 4.01\times 10^{20} molecules

Given:

120. mg of the aspirin

To find:

The molecules of aspirin in 120. mg of aspirin.

Solution

Mass of aspirin = 120. mg

1mg = 0.001 g\\\\120. mg=120.\times 0.001 g=0.120 g

Molar mass of aspirin = 180.158 g/mol

Moles of aspirin == \frac{0.120 g}{180.158 g/mol}=0.000666 mol

According to the mole concept:

1 mole = N_A=6.022\times 10^{23} atoms/molecule/ions

The molecules of aspirin in 0.000666 moles of aspirin:

=0.000666\times 6.022\times 10^{23} molecules\\\\=4.01\times 10^{20} molecules

The number of molecules of aspirin is 4.01\times 10^{20} molecules.

Learn more about the mole concept here:

brainly.com/question/7287712?referrer=searchResults

brainly.com/question/2293005?referrer=searchResults

8 0
2 years ago
Addition of an excess of lead (II) nitrate to a 50.0mL solution of magnesium chloride caused a formation of 7.35g of lead (II) c
KiRa [710]

Answer:

[Cl⁻] = 0.016M

Explanation:

First of all, we determine the reaction:

Pb(NO₃)₂ (aq) + MgCl₂ (aq) → PbCl₂ (s) ↓  +  Mg(NO₃)₂(aq)

This is a solubility equilibrium, where you have a precipitate formed, lead(II) chloride. This salt can be dissociated as:

           PbCl₂(s)  ⇄  Pb²⁺ (aq)  +  2Cl⁻ (aq)     Kps

Initial        x

React       s

Eq          x - s              s                  2s

As this is an equilibrium, the Kps works as the constant (Solubility product):

Kps = s . (2s)²

Kps = 4s³ = 1.7ₓ10⁻⁵

4s³ = 1.7ₓ10⁻⁵

s =  ∛(1.7ₓ10⁻⁵ . 1/4)

s = 0.016 M

3 0
3 years ago
How many seconds are in one year?<br> how many seconds are in 1 year
Alja [10]

Answer:

Hey mate.....

Explanation:

This is ur answer....

<em>31,536,000 seconds </em>

<em>drum roll, please… one year would equal 365 times 24 times 60 times 60 seconds…or 31,536,000 seconds! That's over 31 million seconds you have to spend over the next year....</em>

<em></em>

Hope it helps u,

Mark me brainliest pls....

FOLLOW ME! :)

5 0
3 years ago
What is the mole ratio that can convert from moles of A to moles of B?
kaheart [24]
There is no direct way to convert from the mass of one substance to the mass of another. To convert from one mass (substance A) to another mass (substance B), you must convert the mass of A first to moles, then use the mole-to-mole conversion factor (B/A), then convert the mole amount of B back to grams of B.
8 0
3 years ago
Which of the following statements is true about gas particles? The space between them is very small. They repel each other with
allsm [11]

Answer:

The attractive forces between them is very weak

Explanation:

5 0
4 years ago
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