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aniked [119]
3 years ago
9

Which statement describes an interaction between the biosphere

Chemistry
2 answers:
77julia77 [94]3 years ago
8 0

The answer to you question is. It is the part of earth that contains living organisms so D

Alona [7]3 years ago
6 0
I’d go with A, only one that kind of makes sense
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Determine the number of moles in 254 molecules of bromine.
Natali5045456 [20]

Answer:

4.22 × 10 ⁻²² mol

Explanation:

Given data:

Number of molecules of bromine = 254 molecules

Number of moles = ?

Solution:

1 mole = 6.02 × 10 ²³ molecules

254 molecules × 1  mol / 6.02 × 10 ²³ molecules

42.2 × 10 ⁻²³ mol

4.22 × 10 ⁻²² mol

3 0
3 years ago
Are carbon atoms a pure substance or a mixture?
vichka [17]

Answer:

Substance

Explanation:

7 0
3 years ago
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What is the molarity of a solution if 0.529 moles of LiCl is dissolved in 687 mL of water?
Dominik [7]

Answer:

Molarity of solution = 0.77 (Approx.)

Explanation:

Given:

Moles of LiCl = 0.529

Volume of water  = 687

Find:

Molarity of solution

Computation:

Molarity of solution = [Moles/Volume]1000

Molarity of solution = [0.529/687]1000

Molarity of solution = 0.77 (Approx.)

5 0
3 years ago
A) Compute the repeat unit molecular weight of polystyrene. B) Compute the number-average molecular weight for a polystyrene for
Andrej [43]

Answer:

Explanation:

In Polystrene, the molecular formula for the repeat unit = C_8H_8;

and the atomic weights of Carbon C = 12.01 g/mol

For Hydrogen, it is 1.01 g/mol

Hence, the repeat unit molecular weight is:

m = 8 (12.01 g/mol)+8(1.01 g/mol)

m = 96.08 g/mol + 8.08 g/mol

m = 104.16 g/mol

The degree of polymerization = no-average molecular weight/repeat unit molecular weight.

Mathematically;

DP = \dfrac{\overline M_n}{m}

\overline M_n= DP \times m

\overline M_n= 25000 \times 104.16 \ g/mol

\overline M_n= 2604000  \ g/mol

7 0
3 years ago
Hii pls help me to balance the equation thanksss​
fenix001 [56]

Answer:

2H2S (g) + 3O2 (g) = 2H2O (l) + 2SO2 (g)

8 0
3 years ago
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