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2 years ago

6. Which change to a population would cause

Chemistry

1 answer:

IgorC [24]2 years ago

8 0

Answer:

Explanation:

Because I said so

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Which statements correctly describe characteristics of cells? Check all that apply. A. Animal cells are all generally circular i

Gnoma [55]

Answer:

A. Correct

B. Wrong

C. Wrong.

D. Correct.

E. Correct.

Explanation:

8 0

3 years ago

What is the molar mass of NaC2H302?

andrezito [222]

Answer:

82.0343 g/mol

Explanation:

Count each element and the number of atoms for each element. Add them all together. Use the periodic table.

3 0

3 years ago

A solution has a pH of 2.5. Answer the following questions. pOH = [H]= [OH]=

Sloan [31]

Answer:

pOH = 11.5

[H⁺] = 0.003 M

[OH⁻] = 3 × 10⁻¹² M

Explanation:

The computation is shown below:

Given that

pH = 2.5

Based on the above information

We know that

pH + pOH = 14 ⇒ pOH = 14 - pH

pOH = 14 - 2.5

pOH = 11.5

[H⁺] = 10^(-pH) = 10^(-2.5)

[H⁺] = 0.003 M

[OH⁻] = 10^(-pOH)

= 10^(-11.5)

= 3 × 10⁻¹² M

[OH⁻] = 3 × 10⁻¹² M

Hence, the above represents the answer

4 0

3 years ago

Please help i got no clue how to do dis

mamaluj [8]

Answer:

Sulfur's Atomic #: 16

Fluorine's Atomic #: 9

Antimony's Atomic #: 51

Silver's Atomic #: 47

Rubidium's Atomic #: 37

Copper's Atomic #: 29

Tin's Atomic #: 50

Mercury's Atomic #: 80

Promethium's Atomic #: 61

3 0

3 years ago

Calculate the molality of 25.0 grams of potassium bromide dissolved in 900 mL of pure water. (density of pure water is 1.0 g/mL)

Orlov [11]

Answer:

0.23mol/kg

Explanation:

Given parameters:

Mass of Potassium Bromide = 25g

Volume of pure water = 900mL

Unknown:

Molality = ?

Solution:

Molality is one of the ways of measuring concentration. It is the number of moles of solute in given mass of solvent.

Mathematically;

Molality = $\frac{number of moles }{mass of solvent}$

Number of moles of KBr;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of KBr = 39 + 80 = 119g/mol

Number of moles = $\frac{25}{119}$ = 0.21mole

Mass of solvent;

Mass of solvent = density of water x volume of water

Mass of solvent = 1.0g/mL x 900mL = 900g = 0.9kg

Now;

Molality = $\frac{0.21}{0.9}$ = 0.23mol/kg

8 0

3 years ago