What mass of sodium nitrate is dissolved in 126 g of a solution that is 14.8% by mass of the compound?

Answers

Answer 1

Answer:

Answer:

there are 18.65 grams of sodium nitrate dissolved in 126 grams of the solution that is 14.8% by mass of the compound.

Explanation:

To find the mass of sodium nitrate dissolved in the solution, we can use the concept of percent composition.

First, we need to determine the mass of the solution that is made up of sodium nitrate. Since the solution is 14.8% by mass of the compound, we can calculate this by multiplying the total mass of the solution by the percentage:

Mass of sodium nitrate in solution = (14.8/100) * 126 g

Mass of sodium nitrate in solution = 18.65 g

Therefore, there are 18.65 grams of sodium nitrate dissolved in 126 grams of the solution that is 14.8% by mass of the compound.

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The reduced vapor pressure at high altitudes causes a liquid to boil at a temperature.A. Lower
B. Higher

Answers

Answer:

Lower Temperature

Explanation:

The boiling point is defined as the temperature at which the vapor pressure of a given liquid becomes equal to the external pressure or atmospheric pressure. Boiling point is mainly effected by following factors:

1) Inter-Molecular Interactions:

Greater the intermolecular interactions greater will be the boiling point because more energy is required to overcome these intermolecular interactions.

Example:

Water = 100 °C

Diethyl ether = 34.5 °C

Water requires more energy because it contains hydrogen bond interactions which are considered the strongest intermolecular interactions. While, Diethyl ether lacks Hydrogen bondings.

2) External Pressure:

The boiling point also varies with changing the external pressure for the same solvent. Greater the external pressure greater will be the boiling points and vice versa.

Example:

Water:

External Pressure Boiling Point

1 atm 100 °C

0.921 atm 98 °C

0.425 atm 72 °C

At higher altitudes (and thus lower atmospheric pressures), water boils at a lower temperature. This is because the lack of vapor pressure at that altitude doesn't constrain the speed of the molecules with barometric pressure. Therefore, the water begins boiling at a lower temperature. This is often a disadvantage because even if the water is boiling, it won't be hot enough for meals (which is why heat and temperature are distinct). That's why we have pressure cookers, which manage to keep a stable boiling point.
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How many moles are in 987 grams of Ra(OH)2?

Answers

The number of moles in 987 grams of Ra(OH)2 = 3.8 moles

Calculating number of moles

Ra = 226g

O= 16g

H = 1

Therefore molar mass of Ra(OH)2= 226+ (16+1)×2

= 260g/mol

The molar mass of Ra(OH)2 = 260g/mol

Thus means that 260g of Ra(OH)2 makes up 1 mole

Therefore, 987 g = X moles

Make X moles the subject of formula,

X mole = 987/260

= 3.8 moles

Therefore, the number of moles in 987 grams of Ra(OH)2 = 3.8 moles

Learn more about molar mass here:

brainly.com/question/14469428

Answer : 3.79 moles are in 987 grams of $Ra(OH)_2$ .

Solution : Given,

Mass of $Ra(OH)_2$ = 987 g

Molar mass of $Ra(OH)_2$ = 260 g/mole

Now we have to calculate the moles of $Ra(OH)_2$ .

Formula used :

$\text{Moles of }Ra(OH)_2=\frac{\text{Mass of }Ra(OH)_2}{\text{Molar mass of }Ra(OH)_2}$

Now put all the given values in this formula, we get the moles.

$\text{Moles of }Ra(OH)_2=(987g)/(260g/mole)=3.79moles$

Therefore, 3.79 moles are in 987 grams of $Ra(OH)_2$ .

Hey! If someone could help me out I would really appreciate it even if it was just one answer. I'm really stuck on 3. Its second year of chem!

Answers

Answer:

I would go for number 5 . It sounds more logical to me.

Gabriella weighs 450 N. She climbs a flight of stairs to a height of 3 m. It takes her 5 seconds. How much work does Gabriella do when she climbs the stairs?A.
150 J

B.
270 J

C.
1350 J

D.
2250 J

Answers

The formula that can be applied in this problem is W = Fd where W is work, F is the force and d is distance. You have 450N and 3m, all you have to do is to multiply it.

W = Fd

W = (450N) (3m)

W = 1350J

The answer is letter C.

What is an intramolecular force?Answer: A force acting between the atoms within a molecule

Answers

Answer:

no tengo la menor idea de que es

A sample of nitric acid contains both H3O ions and NO3 ions. This sample has a pHvalue of 1.
What is the color of methyl orange after it is added to this sample?

Answers

The indicator will lead to a solution that has a red color. Methyl orange is an indicator used in titrations because it changes colors at all pH values. When in acidic solution it is red and in basic it is yellow. A pH of 1 is acidic, therefore a red solution.

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