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ziro4ka [17]
3 years ago
11

Concentrations expressed as a percent by mass are useful when the solute is a _____.

Chemistry
2 answers:
elixir [45]3 years ago
4 0

Answer:

Solid

Explanation:

A solid such as sugar can be measured and added to a solute to form a solution. The amount of solute present can be expressed as a percentage.

Westkost [7]3 years ago
3 0

C. Solid

Although molarity is commonly used to express concentrations for reactions in solution or for titrations, it does have one drawback—molarity is the number of moles of solute divided by the volume of the solution, and the volume of a solution depends on its density, which is a function of temperature.

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Calculate the molarity of the two solutions.
beks73 [17]

Answer:

A = Molarity = 0.22 M

B = Molarity = 0.36 M

Explanation:

Given data:

For first solution:

number of moles = 0.550 mol

Volume of solution = 2.50 L

Molarity = ?

Molarity:

Formula:

Molarity = number of moles of solute / volume of solution in L.

Molarity = 0.550 mol / 2.50 L

Molarity = 0.22 M

For second solution:

Mass of NaCl =  15.7 g

Volume of solution = 709 mL  or 709/1000 = 0.709 L

Molarity = ?

Solution:

Number of moles = mass / molar mass

Number of moles = 14.7 g/ 58.44 g/mol

Number of moles = 0.252 mol

Molarity:

Molarity = number of moles of solute / volume of solution in L.

Molarity = 0.252 mol / 0.709 L

Molarity = 0.36 M

8 0
3 years ago
Benzoic acid, c6h5cooh, has a ka = 6.4 x 10-5. what is the concentration of h3o+ in a 0.5 m solution of benzoic acid? 3.2 x 10-5
FinnZ [79.3K]
The answer for this issue is: 
The chemical equation is: HBz + H2O <- - > H3O+ + Bz- 
Ka = 6.4X10^-5 = [H3O+][Bz-]/[HBz] 
Let x = [H3O+] = [Bz-], and [HBz] = 0.5 - x. 
Accept that x is little contrasted with 0.5 M. At that point, 
Ka = 6.4X10^-5 = x^2/0.5 
x = [H3O+] = 5.6X10^-3 M 
pH = 2.25
(x is without a doubt little contrasted with 0.5, so the presumption above was OK to make) 
3 0
3 years ago
which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are ta
pentagon [3]

The answer is A. Volcanoes and earthquakes often occur near place boundaries. Volcanoes are exit points for heat from the Earth's core. And Earthquakes are caused by the tectonic places colliding along another one. For example one tectonic plate would be slowly moving south, and another next to it could collide with the South-going plate while going North, and that is what causes Earthquakes.

4 0
3 years ago
Read 2 more answers
What determines the velocity of an object
maxonik [38]

Answer:

the direction of the object

Explanation:

4 0
3 years ago
How do sound waves transfer energy?
bazaltina [42]

Answer:

By the vibration of particles in a medium

Explanation:

For example, the energy in sound waves is transferred by the vibration of the molecules in air.

A is wrong. Electromagnetic radiation transfers energy through vibrating electric and magnetic fields.

B is wrong. Sound waves can transfer energy far from the ocean.

C is wrong. A combination of waves just makes a wave with a different shape.

8 0
3 years ago
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