CHEMISTRY HIGH SCHOOL

How is molarity measured?O
A. In liters of water per moles of a dissolved substance
B. In liters of water per gram of a dissolved substance
O
C. In moles of a substance for 1 g of that substance
D. In moles of a substance dissolved in 1 L of water

Answers

Answer 1

Answer:

Answer:

D. In moles of a substance dissolved in 1 L of water

Explanation:

Just took the test

Answer 2

Answer:

Final answer:

Molarity is measured in moles of a substance dissolved in 1 L of water.

Explanation:

The molarity is measured in moles of a substance dissolved in 1 liter of water, so the correct option is D. In moles of a substance dissolved in 1 L of water. Molarity is a measure of the concentration of a solute in a solution. It is calculated by dividing the number of moles of solute by the volume of the solution in liters.

Molarity (M) is indeed a measure of the concentration of a solute in a solution and is defined as the number of moles of solute per liter of solution. This means it is measured in "moles of a substance dissolved in 1 liter of solution" or simply "moles/L" or "mol/L." Molarity is a fundamental concept in chemistry and is widely used in various chemical calculations and experiments to express the concentration of a substance in a solution.

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How many atoms are in 5 moles of CH4

Answers

molar mass CH4 = 12 + 1 . 4 = 16 g/mol

1 mole CH4 ------------ 16 g
5 moles CH4 ---------- x g

x = 5 . 16

x = 80 g

16 g CH4 ------------------ 6,02.10²³ atoms
80 g CH4 ------------------ y atoms

16 . y = 80 . 6.02x10²³

16 y = $4,81.10 ^(25)$

y = $(4,81.10 ^(25) )/(16)$

y = $3,01.10 ^(24)$ atoms

hope this helps

Which best describes the trends in electronegativity on the periodic table?

Answers

The correct answer is:

Electronegativity increases up and to the right

Explanation:

Electronegativity, logo χ, is a chemical property that explains the trend of an atom to attract a shared pair of electrons towards itself.As you move from left to right across the periodic table, electronegativity increases, and as you move down the table electronegativity decreases.

Electronegativity is higher on the right side of the periodic table, such as the noble gasses. There electronegativity is around 3.0 and 4.0 while the left side has electronegativity ranging from .7 to 1.0

a sample of copper wire with a mass of 1.659 g is heated with excess powdered sulfur until the copper has combined with the sulfur, and all the extra sulfur has been burned off. The final product (a sulfide of copper ) has a mass of 2.080 g. Calculate the empirical formula of the product, and name it.

Answers

Copper mass = 1.659
Copper moles = 1.659 / 64 = 0.0259

Sulfur mass = 2.08 - 1.659 = 0.421
Sulfur moles = 0.421 / 32 = 0.0131

Ratio Copper : Sulfur = 2 : 1

Empirical formula: Cu ₂ S
Name: Copper (I) sulfide

0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution. How do I solve this?

Answers

The concentration of the solution has been 0.17 M.

The molarity has been defined as the moles of solute that has been dissolved in a liter of solution. The molarity of the solution has been expressed as:

$\rm Molarity=(Mass)/(Molar\;mass)\;*\;(1)/(Volume\;(L))$

Computation for Molarity of the solution

The molar mass of sodium chloride solution has been 58.5 g/mol.

The given mass of NaCl in the solution has been 0.5 grams.

The volume of NaCl solution has been 0.05 L.

Substituting the values for molarity of the solution:

$\rm Molarity=(0.5)/(58.5)\;*\;(1)/(0.05\;L)\n\nMolarity=0.17 M$

The concentration of the solution has been 0.17 M. The solution has been prepared by dissolving 0.5 g NaCl in minimal water, and makeup the volume to 0.05 L.

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If you are trying to find the molarity of this solution you first need to find the number of moles of sodium chloride that are present in the 0.5g sample. To do this you need to divide the mass of sodium chloride (0.5g) by its molar mass (58.45g/mol) to get 0.00855mol of sodium chloride. Then you divide the number of moles (0.00855mol) by the volume of solution (0.05L) to get 0.171M (The units for molarity is mol/L). Therefore the solution has a concentration of 0.171M.

I hope this helps. Let me know in the comments if anything was unclear or if you were asking a different question.

Which fraction of a Sr-20 sample remains unchanged after 87.3 years?

Answers

First off there are some issues in your questions but I can still help in answering this type of problem. First, there is no Sr-20. The 4 abundant form includes Sr-84, Sr-88, Sr-87, Sr-86, Sr-84.
More importantly, the half life of strontium must be given.

For demonstration sake, let us assume Sr-85 is the isotope. It has a half-life of 64.853 days and I'm assuming the units of 87.3 is in days.

A/Ao = e^-(ln2/t)T

where A- final amount Ao -initial amount t- halflife T-total time elapsed

% = e^-(ln2/64.853)(87.3) = 0.3933 or 39.33%

Your teacher placed a drop of food coloring in a cup of water. the color slowly mixed into the water without being stirred. what does this tell you about water molecules?