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densk [106]
3 years ago
8

Assume you have 60 micrograms (1 microgram = 10-6 gram) of pure u-238. how many nuclei n0 is this? (recall avogadro's number equ

als 6.022×1023 particles per mole.)
Chemistry
1 answer:
oee [108]3 years ago
5 0
Atomic mass of Uranium is 238.

Hence, 1 mole = 238 g of Uranium will have 6.022×10^23 of Uranium nuclei.

∴, 60 X 10^-6 g of Uranium will have \frac{6.022X10^2^3X60X10^-^6}{238} = 1.518 X 10^17 nuclei of Uranium.
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3,010,000 into scientific notation
skelet666 [1.2K]

Answer:

3.01 x 10 to the power of 6

Explanation:

Step 1

To find a, take the number and move a decimal place to the right one position.

Original Number: 3,010,000

New Number: 3.010000

Step 2

Now, to find b, count how many places to the right of the decimal.

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If the volume of a gas container at 32 degrees Celsius changes from 1.55 L to 755 mL, what will the final temperature be?
QveST [7]
So to solve this you need to know Charles’s law which is: V1/T1=V2/T2. Where T1 and V1 is the initial volume and Temperature and V2 and T2 is the temperature and volume afterwards. So first plug in the numbers you are given. V1= 1.55L T1= 32C° V2= 755mL T2=?. Since your volumes are two different units you change 755mL to be in L so that would be 0.755 L. And since your temp isn’t in Kelvin you do 273+32= 305K°. You then would rearrange your equation to solve for T2 which is V2T1/V1. Then you plug in your numbers (0.755L)(305K)/1.55L. Then you solve and would be 148.5645161 —> 1.49 x 10^2 K
4 0
3 years ago
Using the Br?nsted-Lowry concept of acids and bases, identify the Br?nsted-Lowry acid and base in each of the following reaction
antiseptic1488 [7]

Answer:

H_2PO_3^- is Bronsted Lowry base.

H_2O is Bronsted Lowry acid.

Explanation:

According to the Bronsted Lowry conjugate acid-base theory:

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  • A base is defined as a substance which accepts protons and forms conjugate acid.

H_2PO_3^-(aq)+H2O(l)\rightarrow H_3PO_3(aq)+OH^-(aq)

H_2PO_3^- is Bronsted Lowry base.It accepts protons and forms conjugate acid H_3PO_3

H_2O is Bronsted Lowry acid.It donates protons and forms conjugate base OH^-

(CH_3)_2NH(g)+BF_3(g)\rightarrow (CH_3)_2NHBF_3(s)

There in no exchange of proton in an above reaction.Neither of the reactants and products are Bronsted Lowry acid or Bronsted Lowry base

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3 years ago
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