What is the new boiling point if 25 g of NaCl is dissolved in 1.0 kg of water

Answers

Answer 1

Answer: The correct answer for the question that is being presented above is this one:

Given that:
delta Tb = Kbm Kb H2O = 0.52 degrees C/m
delta Tf = Kfm Kf H2O = 1.86 degrees C/m

We need to know the formula for Molality.
molality = mol solute / kg solvent

We are given the amount of solute in grams
Since amount of solute is given in moles, we have to convert 25 g NaCl to moles. Divide by molar mass.

25 g NaCl / 58.5 g/mol = 0.427 mol

Then, use the formula for molality.

molality = mol solute / kg solvent
= 0.427 / 1
= 0.427 m

Use now the formula to get the boiling point.

delta Tb = Kbm
= (0.52)(0.427)
= 0.22C

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How would a solution that is labeled 5.0 molar be similar to one labeled 5.0 molal?
Ammonia, NH3, can be classified as a base because in a chemical reaction with an acid, ammonia will (1 point)produce hydroxide ions in solution. produce hydronium ions in solution. donate a proton and become NH2–. accept a proton and become NH4+.
The equation below shows the decomposition of lead nitrate. How many molecules of PbO are produced when 11.5 g NO2 is formed?2Pb(NO3 )2 (s) → 2PbO(s) + 4NO2 (g) + O2 (g)

A combustion reaction took place each time you used the Bunsen burner to burn methane gas (CH4). Write a balanced chemical equation for the combustion of methane. *HINT: All hydrocarbon combustion reactions need oxygen as a reactant and form the same two products.

Answers

Answer:

The answer to your question is CH₄ + 2O₂ ⇒ CO₂ + 2H₂O

Explanation:

Data

Methane = CH₄

Oxygen = O₂

Process

A combustion reaction is a kind of chemical reaction in which an organic compound reacts with oxygen to generate water and carbon dioxide.

Chemical reaction

CH₄ + O₂ ⇒ CO₂ + H₂O

Reactants Elements Products

1 C 1

4 H 2

2 O 3

Balanced chemical reaction

CH₄ + 2O₂ ⇒ CO₂ + 2H₂O

Reactants Elements Products

1 C 1

4 H 4

4 O 4

Final answer:

The balanced chemical equation for the combustion of methane is CH4 + 2O2 -> CO2 + 2H2O. This equation shows that a methane molecule reacts with two oxygen molecules to produce a carbon dioxide molecule and two water molecules while maintaining a balance as per the Law of Conservation of Mass.

Explanation:

The combustion of methane occurs when methane gas (CH4) combines with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). This reaction can be represented by the following balanced chemical equation:

CH4 + 2O2 -> CO2 + 2H2O

This means that one molecule of methane reacts with 2 molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water. The chemical equation is balanced, meaning that the number of atoms of each element is the same on both sides of the equation as required by the Law of Conservation of Mass.

Learn more about Combustion of Methane here:

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Which sample of matter is a mixture?
(1) Br2(ℓ) (3) KBr(s)
(2) K(s) (4) KBr(aq)

Answers

The correct answer is option 4. KBr(aq) is an example of a mixture. The symbol (aq) means that the substance is in aqueous form. Thus, potassium bromide is dissolved in water. Mixture is defined as a system which contains two or more substances mixed but not combined chemically. The two substances here are KBr and water.

Suppose the mole number of Ca2+ ions in a 50 mL water sample is quantified as 1.5 × 10−5 mol. What is the concentration of Ca2+ ions in the water sample in ppm CaCO3?

Answers

$(1.5x 10^(-5) mol Ca^(2+))/(50ml) ( (1 mol CaC O_(3) )/(1 mol Ca^(2+) ) )( (100,000 ppm)/(1 molCaC O_(3)/L ) ) \n =0.0300234$

Answer : The concentration of $Ca^(2+)$ ions in the water sample in ppm is, 12000 ppm

Solution : Given,

Moles of calcium = $1.5* 10^(-5)moles$

Molar mass of calcium = 40 g/mole

Volume of solution = 50 ml

First we have to calculate the mass of calcium.

$\text{Mass of calcium}=\text{Moles of calcium}* \text{Molar mass of calcium}=(1.5* 10^(-5)moles)* (40g/mole)=60* 10^(-5)g=6000mg$

(1 g = 1000 mg)

Now we have to calculate the concentration of calcium.

$\text{Concentration of calcium}=\frac{\text{Mass of calcium}* 1000}{\text{Volume of solution}}=(6000mg* 1000)/(50ml)=12000mg/L=12000ppm$

(1 ppm = 1 mg/L)

Therefore, the concentration of $Ca^(2+)$ ions in the water sample in ppm is, 12000 ppm

The Haber process can be used to produce ammonia (NH3) from hydrogen gas (H2) and nitrogen gas (N2). The balanced equation for this process is shown below. 3H2 N2 Right arrow. 2NH3 The molar mass of NH3 is 17. 03 g/mol. The molar mass of H2 is 2. 0158 g/mol. In a particular reaction, 0. 575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures? 0. 1 0. 102 0. 10209 0. 1021.

Answers

Answer:

Explanation:

We are given that ammonia can be produced from hydrogen gas and nitrogen gas according to the equation:

$\displaystyle 3\text{H$_2$} + \text{N$_2$} \longrightarrow 2\text{NH$_3$}$

We want to determine the mass of hydrogen gas that must have reacted if 0.575 g of NH₃ was produced.

To do so, we can convert from grams of NH₃ to moles of NH₃, moles of NH₃ to moles of H₂, and moles of H₂ to grams of H₂.

We are given that the molar masses of NH₃ and H₂ are 17.03 g/mol and 2.0158 g/mol, respectively.

From the equation, we can see that two moles of NH₃ is produced from every three moles of H₂.

With the initial value, perform dimensional analysis:

$\displaystyle \begin{aligned} 0.575\text{ g NH$_3$}& \cdot \frac{1\text{ mol NH$_3$}}{17.03\text{ g NH$_3$}} \cdot\frac{3\text{ mol H$_2$}}{2\text{ mol NH$_3$}} \cdot \frac{2.0158\text{ g H$_2$}}{1\text{ mol H$_2$}} \n \n & = 0.102\text{ g H$_2$}\end{aligned}$

*Assuming 100% efficiency.

Our final answer should have three significant figures. (The first term has three, the second term has four (the one is exact), the third term is exact, and the fourth term has five. Hence, the product should have only three.)

In conclusion, our answer is B.

HELPPP| WILL MARK BRAINLEST Rosalinda is thirsty and wants to make a glass of lemonade as quickly as possible. She needs to add sugar to lemon juice and water to make the lemonade. Which type of sugar should she use?
Group of answer choices

granulated sugar with fine grains

sugar formed into cubes

raw sugar with coarse grains

sugar from rock candy

Answers

Answer:

she use granulated sugar with fine grains as it is easily dissolved so she used in lemonade.

How is a weather report different from a weather forecast

Answers

A weather forecast differs from the weather report in that the weather forecast is the application of science and technology to predict the state of the atmosphere for a given location; whereas the weather report is a systematic statement of the existing and usually the predicted meteorological conditions over a particular area.

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An aqueous solution was prepared containing 1.0mol of AgNO3 and 1.0mol of FeSO4 in 1.00 dm^3. of water. When equilibrium was established, there was 0.44mol of Ag+(aq) in the mixture. Ag + (aq) + Fe2 + (aq) <==> Ag(s) + Fe3+ (aq) . What is the numerical value of Kc? . A 0.35 B 0.62 C 1.62 D 2.89