CHEMISTRY HIGH SCHOOL

What is the molality of a solution in which 3.0 moles of NaCl is dissolved in 1.5 Kg of water?

Answers

Answer 1
Answer:

The molality of the sodium chloride solution is 2.0 mol/kg.

Given:

3.0 moles of NaCl in 1.5 kilograms of water.

To find:

The molality of the solution

Solution:

The moles of solute that is sodium chloride = 3.0 mol

The mass of solvent that is water = 1.5 kg

The molality of the solution:

=(3.0 mol)/(1.5 kg)=2.0 mol/kg

The molality of the sodium chloride solution is 2.0 mol/kg.

Learn more about molality here:

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Answer 2
Answer: density H2O = 1g/cm³
1,5 kg H2O = 1500g = 1500cm³             (1dm³ = 1000cm³)

3moles of NaCl-----in---------1500cm³ H2O
x moles of NaCl ----in--------1000cm³ H2O
x = 2moles of NaCl

answer: 2 mol/dm³

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Which of the following factors renders a species more susceptible to disease and infertility?

Answers

The correct answer is this one: "B. inbreeding." Inbreeding renders a species more susceptible to disease and infertility. On the other hand, Large genetic diversity tends to be perceived as beneficial so that a single disease does not wipe out a species. 

Here are the choices
A. Large genetic diversity 
B. inbreeding 
C. crossbreeding 
D. recessive traits

Answer:

inbreeding

Explanation:

According to the law of conservation of energy, A) an object loses most of its energy as friction. B) the total amount of energy for a system stays the same. C) the potential energy of an object is always greater than its kinetic energy. D) the kinetic energy of an object is always greater than its potential energy.

Answers

I did research and got B

Answer:

B.

Explanation:

25. In the formula for a molecular compound, which atom generally comes first? You may wentto refer to a periodic table.

Answers

Answer:

For organic compounds, carbon and hydrogen are listed as the first elements in the molecular formula, and they are followed by the remaining elements in alphabetical order. For example, for butane, the molecular formula is C 4 H 10.

Explanation:

A buffering solution consists of both strong acids and bases.
a. True
b. False

Answers

False. A buffering solution consists of a WEAK acid such as CH3COOH, C5H5N, or ammonia. A buffering solution resists pH change upon the addition of an acidic or basic components. It can neutralize little amounts of added acid or base, thus maintaining the pH of the solution relatively stable. The correct answer is letter "B. false"

What stays the same when’s solution is diluted by adding more solvent

Answers

The amount of solute does not change.((:

Which of the following statements does not apply to water?a. Like all liquids, water assumes the shape of its container.
b. Water is a polar molecule.
c. The strong surface tension of water allows it to adhere to the sides of a container and actually move up tubing via capillary action.
d. Water cannot be found in other places in the universe.

Answers

the answer is c the strong surface tension of water allows it to adhere to the sides of the container and actually move up tubing via capillary action
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