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Lynna [10]
3 years ago
6

If China has a population of 1,355,935,022 people and an area of 3,705,405 mi2028-02-04-03-00_files/i0160000.jpg, what is the po

pulation density of China?
Chemistry
1 answer:
mote1985 [20]3 years ago
4 0
The correct answer is D.) 366 people/mi
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A piece of notebook paper
VikaD [51]
An element but I’m not too sure
4 0
4 years ago
Read 2 more answers
What is the mass of 3.01 x 10^21 atoms of Co
OlgaM077 [116]

Answer:

0.295 g Co

General Formulas and Concepts:

<u>Chemistry - Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

<u>Step 1: Define</u>

3.01 × 10²¹ atoms Co

<u>Step 2: Identify Conversions</u>

Avogadro's Number

Molar Mass of Co - 58.93 g/mol

<u>Step 3: Convert</u>

<u />3.01 \cdot 10^{21} \ atoms \ Co(\frac{1 \ mol \ Co}{6.022 \cdot 10^{23} \ atoms \ Co} )(\frac{58.93 \ g \ Co}{1 \ mol \ Co} ) = 0.294552 g Co

<u>Step 4: Check</u>

<em>We are given 3 sig figs. Follow sig fig rules and round.</em>

0.294552 g Co ≈ 0.295 g Co

5 0
3 years ago
What are the characteristics of non-ideal solutions? a. The solute-solute and solvent- solvent interaction is different fromm th
finlep [7]

Answer:All the above

Explanation:

Non-ideal solutions are those solutions which do not obey Raoult's law in any conditions.

The molecular interactions of two components that is solute and solvent  are different.

If there are two components A and B then the molecular interaction between A-A,B-B would be different from the molecular interactions in A-B .

The enthalpy of mixing and volume of mixing for non-ideal solutions have  non zero values.

Enthalpy of mixing can be negative or positive in case of non-ideal solutions. If the enthalpy of mixing is negative so energy has been  released upon mixing the two components and if enthalpy of mixing is positive then energy is absorbed upon mixing the two components.

Non-ideal solutions are simply those solutions which are not ideal hence they should not be having the characterstics of ideal solutions.

For ideal solutions the molecular interactions between  the two components are equal.

So the molecular interaction between A-A,B-B  would be equal to the molecular interaction between A-B. Also the enthalpy of mixing and volume of mixing for ideal solutions are zero hence all the statements provided here are correctly charactersing non-ideal solutions.

4 0
4 years ago
Complete the sentence. ______________ is thought to be most responsible for the salinity of the oceans.
Anettt [7]
The best and most correct answer among the choices provided by your question is the fourth choice or letter D. Natural run-off from mountain ranges <span>is thought to be most responsible for the salinity of the oceans.

</span>After years and years of river inflow and evaporation, the salt<span> content of the lake water built up to the present levels. The same process made the seas </span>salty<span>. Rivers carry dissolved salts to the </span>ocean<span>. Water evaporates from the </span>oceans<span> to fall again as rain and to feed the rivers, but the salts remain in the </span>ocean<span>.</span>
5 0
3 years ago
What is the pH of a 3.5 x 10-5 M solution of HCl?
Luden [163]

Answer:

pH = 4.45

Explanation:

We need to find the pH of 3.5\times 10^{-5}\ M solution of HCl. We know that, pH of a solution is given by :

pH=-log[H]^+

Put all the values,

pH=-log[3.5\times 10^{-5}]\\\\pH=4.45

So, the pH of the solution of HCl is 4.45.

5 0
3 years ago
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