1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
notka56 [123]
3 years ago
15

Please help fast!! I need someone to see if my answers are correct! If any are wrong please let me know what the correct answers

would be and how to get that answer!
1. how many moles of sodium chloride are in 28 grams od NaCl?

A. .265 mole NaCl
B. .856 mole NaCl
C. .479 mole of NaCl
D. 1.2 mole NaCl <my choice

2. 734 grams of lithium sulfate (Li2SO4) are dissolved to make 2500 mL of solution what is rhe molaratiy?

A. 2.67 M
B. 4.56 M
C. 3.89 M <my choice
D. 1.78 M

3. how many grams of CaCl2 would be dissolved in 3.0 L of a 0.50 M solution of CaCl2?

A. 250 g CaCl2
B. 166.5 g CaCl2
C. 113.65 g CaCl2
D. 98 g CaCl2 <my choice

4. Suppose you had 58.44 g of NaCl and you dissolved it in exactly 2.00 liters. The molarity if the solution would be 0.5 M

true <my choice
false

5. I would need 22g of NaOH to make a 3.0 M solution using 250 mL of solvent.

true <my choice
false

6. Identify the solute:
you have a .0195 M solution made from using 6.5 g of solute and 3 L of solvent. Identify the solute by solving for molar weight.

A. the solute is NaCl because the molar weight is 58.43 g/mol <my choice

B. the solute is H2SO4 because the molar weight is 98.06 g/mol

C. the solute is CaCl2 because the molar weight is 111.11 g/mol
Chemistry
1 answer:
marta [7]3 years ago
4 0

Yeah all of them are right :)

You might be interested in
C8H10N4O2 is the chemical formula for caffeine, there are 8 carbons. List the 3 remaining elements in caffeine and how many atom
Nataly [62]
Caffeine   that  is C8H10N402  is molecule which made   up  of   4 different elements. apart  from  carbon  the  other  element  includes

element        symbol
nitrogen          N
oxygen           O
hydrogen        H
The number  of  atom  present in caffeine molecule  are  as follows

Nitrogen=4  atoms
Oxygen=2  atoms
Hydrogen=10 atoms

4 0
3 years ago
A chemist dissolves of pure potassium hydroxide in enough water to make up of solution. Calculate the pH of the solution. (The t
Leya [2.2K]

Answer:

12.99

Explanation:

<em>A chemist dissolves 716. mg of pure potassium hydroxide in enough water to make up 130. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits.</em>

Step 1: Given data

  • Mass of KOH: 716. mg (0.716 g)
  • Volume of the solution: 130. mL (0.130 L)

Step 2: Calculate the moles corresponding to 0.716 g of KOH

The molar mass of KOH is 56.11 g/mol.

0.716 g × 1 mol/56.11 g = 0.0128 mol

Step 3: Calculate the molar concentration of KOH

[KOH] = 0.0128 mol/0.130 L = 0.0985 M

Step 4: Write the ionization reaction of KOH

KOH(aq) ⇒ K⁺(aq) + OH⁻(aq)

The molar ratio of KOH to OH⁻is 1:1. Then, [OH⁻] = 0.0985 M

Step 5: Calculate the pOH

We will use the following expression.

pOH = -log [OH⁻] = -log 0.0985 = 1.01

Step 6: Calculate the pH

We will use the following expression.

pH + pOH = 14

pH = 14 - pOH = 14 -1.01 = 12.99

8 0
2 years ago
Explain at least one observation you can make about the political borders and the language borders shown on the maps.
bazaltina [42]

Answer:

A boundary is a real or imaginary line that separates two things. In geography, boundaries separate different regions of the Earth.The most obvious type of boundary is a physical boundary. A physical boundary is a naturally occurring barrier between two areas. Rivers, mountain ranges, oceans, and deserts can all serve as physical boundaries. Many times, political boundaries between countries or states form along physical boundaries. For example, the boundary between France and Spain follows the peaks of the Pyrenees Mountains, while the Alps separate France from Italy.

The Strait of Gibraltar is the boundary between southwestern Europe and northwestern Africa. This narrow waterway between the Atlantic Ocean and the Mediterranean Sea is an important political, economic, and social boundary between the continents.

Rivers are common boundaries between nations, states, and smaller political units such as counties. The Rio Grande forms a large part of the boundary between Mexico and the United States. The Mississippi Riveris the defining boundary between many of the states it winds through, including Iowa and Illinois, Arkansas and Tennessee, and Louisiana and Mississippi.

7 0
2 years ago
What important material is absorbed by your digestive system besides water
Leto [7]

Answer:

The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining

Explanation:

3 0
3 years ago
Read 2 more answers
You shake a can of soda and open it, which cause the pressure to decrease. what happens to the volume of the CO2. the soda​
navik [9.2K]

Answer: <em>When you take the top off of a bottle of soda, the pressure inside the bottle decreases and goes to the same pressure as the atmosphere. When that happens the carbon dioxide inside is no longer forced to be a liquid and turns back into a gas, causing the bubbles that we're so familiar with.</em>

Explanation:

However, producing foaming carbon dioxide gas by shaking a bottle of soda water is a physical change, while producing foaming carbon dioxide gas by combining baking soda and vinegar is a chemical change. ... Because no chemical bonds are broken and no new molecules are formed, this is a physical change in the system.

4 0
3 years ago
Other questions:
  • What substance helps suspend fat in a watery digestive mixture, making fat more available to digestive enzymes?
    5·1 answer
  • The mass number of an atom is found by adding
    12·1 answer
  • What is the name of the element that has electrons arranged <br>2,8,2 ​
    7·2 answers
  • Is A B C or D I need help
    6·1 answer
  • Can you mix copper with rubbing alcohol
    7·1 answer
  • Compare the arrangements of individual particles in solids, liquids, and gases?
    15·1 answer
  • !!15 points!!! Antifreeze is added to a car's radiator to protect it. Which of the following
    6·1 answer
  • 33.75 g of copper are reacted with 117.5 g silver nitrate. How much excess reactant would be unused or left over( in grams)?
    11·1 answer
  • Can yall help me with this one, thanks!
    15·1 answer
  • If 17. 6 g of hcl are used to produce a 14. 5 l solution, what is the ph of the solution?.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!