Density is a measure of mass divided by volume

weight divided by area

volume divided by weight

mass divided by area

Answers

Answer 1

Answer: Density is mass divided by volume.

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What is the pressure (in atmospheres) of the sample of gas trapped in the closed-tube mercury manometer shown below if h = 23.6 cm?

Answers

Given:

Height of the mercury manometer, h = 23.6 cm

To determine:

The pressure of gas trapped in the closed-tube mercury manometer

Explanation:

In the case of a closed tube mercury manometer, the pressure of the gas is equal to the height difference of the mercury levels in the two arms of the manometer.

i.e. P(gas) = P(h)

in this case, h = 23.6 cm = 236 mm

i.e. Pgas = 236 mmHg

Since, 1 atm = 760 mmHg

The corresponding Pgas(atm) = 236 mmHg * 1 atm/760 mmHg = 0.311 atm

Ans: The pressure of the gas is 0.311 atm

Final answer:

The pressure of the gas in the closed-tube mercury manometer is approximately 0.31 atmospheres, calculated by converting the height of the mercury column into atmospheres.

Explanation:

The pressure of a gas in a closed-tube mercury manometer can be determined using the known height of the mercury and the concept of hydrostatic pressure. Firstly, it's important to note that the pressure on either side of the mercury column in the tube is equal. The pressure of the gas is the same as the hydrostatic pressure due to a column of mercury of the given height in the tube.

In the reference solution provided, the height is given as 26.4 cm. However, according to the question, the height is provided as 23.6 cm. Assuming the height is indeed 23.6 cm, we need to convert this to a pressure value. It is known that 1 atm at sea level is equivalent to a column of mercury that is about 760 mm high.

Therefore, we can convert the height of 23.6 cm or 236 mm into atmospheres. To do this, divide 236 mm by 760 mm to find the pressure in atmospheres. Therefore, the pressure of the gas in the manometer is approximately 0.31 atmospheres.

Learn more about Gas Pressure Measurement here:

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Based upon the ion charge of the following polyatomic ions, predict the formula for the following compounds. sulfate = SO4 -2 phosphate = PO4 -3 hydroxide = OH- sodium sulfateNaSo4
Na2SO4
Na(SO4)2
NaSO8

Answers

Answer:

The correct answer is $Na_2SO_4$ .

Explanation:

Given polyatomic ions:

1) Sulfate = $SO_(4)^(2-)$

2) Phosphate = $PO_(4)^(-3)$

3) Hydroxide = $OH^-$

The formula of Sodium sulfate will be:

$2Na^++ SO_(4)^(2-)\rightarrow Na_2SO_4$

Sodium carries 1+ charge and and sulfate ion carries 2-charge. In order to neutralize negative charge on sulfate ion two sodium ions will be needed.

Since the sodium ion is Na+, and sulfate is SO4(2-), you'll need 2 sodiums for a sulfate, making sodium sulfate Na2SO4.

The smallest group of particles in a crystal that retains the shape of the crystal is called theA.cube
B.unit cell
C.cage
D.crystal lattice

Answers

Answer:

The correct answer is B.unit cell

Explanation:

An unit cell is an arrangement of particles (atoms, ions or molecules) in a crystal structure. The repetition of the unit cell reproduces the complete crystalline structure of the solid. Depending on how are located the particles, there are different unit cells, for exaple: simple cubic, body-centered cubic, face-centered cubic.

The answer is B. Unit cell.
Hoped I Helped!

How many moles are present in a 24.5 gram sample of K2Cr2O7?

Answers

the answer to this is solved through stochiometry: the answer is this: 0.0833mol

What value was there in predicting the properties for gaps in Mendeleev's table?

Answers

Predicting the properties for gaps in Mendeleev’s table helps discover new elements. Because during his presentation of his proposed periodic table, he noted some gaps in his table and predicted that there are still unknown elements between those gaps. He uses some prefixes like dvi-, tri-, and eka- in order to give provisional names to his predicted elements. In his periodic table, he also laid out his elements from the lightest to the heaviest element. The lightest elements started from zero, some examples are gases.

Answer:

The Table helps discover new elements.

Explanation:

Which of the following compounds is a gas at room temperature? A : CH3CH2OH B : CH3CH2CH2CH2CH2CH2CH3 C : CH3CH2CH3 D : HOCH2CH2OH

Answers

Answer:

C. $CH_3CH_2CH_3$

Explanation:

Molecules with the stronger intermolecular forces are pulled tightly together to form solid at higher temperatures and that's why the freezing point is higher.

Also, molecules with the stronger intermolecular force have greater interaction between the molecules and thus on heating do not boil easily and have high boiling point also.

Thus, melting point and boiling point increases with increase in number of carbon atoms and also increase in intermolecular forces (like hydrogen bonding, if present).

Thus, the compound which is gas at room temperature is $CH_3CH_2CH_3$ because it has least number of carbon atoms and absence of hydrogen bonding.

Final answer:

Among the choices, only CH3CH2CH3 (propane) is a gas at room temperature. The other compounds, CH3CH2OH (ethanol), CH3CH2CH2CH2CH2CH2CH3 (hexane), and HOCH2CH2OH (ethylene glycol) are all liquids.

Explanation:

Among the four compounds given, compound C, which is CH3CH2CH3 (also known as propane), is a gas at room temperature. Compound A (CH3CH2OH, or ethanol), compound B (CH3CH2CH2CH2CH2CH2CH3, or hexane), and compound D (HOCH2CH2OH, or ethylene glycol) are all liquids at room temperature.

The state of a compound at room temperature depends on factors like molecular mass and intermolecular forces. Propane has a smaller molecular mass and weaker intermolecular forces than the others, making it a gas at room temperature.