Hess Law question. please hahah

15. How are molecules and moles different from mass?

Ierofanga [76]

Answer:

mass gives the mass of atoms while molecular weight gives the mass of molecules

7 0

3 years ago

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In order to make 1 batch of cookies it requires 2 cups flour, 3 eggs, and 1 cup sugar. What would be the coefficients for the fl

DanielleElmas [232]

20 cups of flour, 30 eggs, and 10 cups of sugar

4 0

2 years ago

In lab, a dialysis bag was filled with a 10% sucrose solution and placed in an unlabeled beaker filled with clear liquid. The di

DaniilM [7]

Answer:

Of lower concentration or less concentrated

Explanation:

Osmosis is the movement of solvent from a region of lower concentration of solute to a region of higher concentration of solute through a semipermeable membrane in order to equalize the concentration of the solutions on both sides.

Since the membrane of the bag is semipermeable, then the fact that the bag in the beaker decreased in size, lost volume, and became flaccid indicates that the solution in the bag is of lower solute concentration than the solution in the beaker hence the movement of water molecules into the beaker by osmosis.

5 0

2 years ago

Process in which a nucleus undergoes spontaneous transformation into

Sedbober [7]

Answer: Radioactive decay

Explanation:

Radioactive decay involves the emission of radiation by the nucleus of an element through the process of disentegration of the nucleus.

8 0

3 years ago

The gas SF6 is used to trace air flows because it is non-toxic and can be detected selectively in air at a concentration of 1.0

melomori [17]

SF₆ in the air at a concentration of 1.0 ppb, exerts a partial pressure of 1.0 × 10⁻⁹ atm. At this concentration, 2.3 × 10¹⁰ molecules of SF₆ are contained in 1.0 cm³ of air at 46 °C.

First, we will calculate the partial pressure of SF₆ using the following expression.

$pSF_6 = P \times \frac{ppb}{10^{9} }$

where,

pSF₆: partial pressure of SF₆

P: total pressure of air (we will assume it is 1 atm)

ppb: concentration of SF₆ in parts per billion

$pSF_6 = P \times \frac{ppb}{10^{9} } = 1 atm \times \frac{1.0 ppb}{10^{9} } = 1.0 \times 10^{-9} atm$

Then, we will convert 1.0 cm³ to L using the following conversion factors:

1 cm³ = 1 mL
1 L = 1000 mL

$1.0 cm^{3} \times \frac{1mL}{1cm^{3}} \times \frac{1L}{1000 mL} = 1.0 \times 10^{-3} L$

Next, we will convert 46 °C to Kelvin using the following expression.

$K = \° C + 273.15 = 46 + 273.15 = 319 K$

Afterward, we calculate the moles (n) of sulfur hexafluoride using the ideal gas equation.

$P \times V = n \times R \times T\\n = \frac{P \times V}{R \times T} = \frac{1.0 \times 10^{-9} atm \times 1.0 \times 10^{-3} L}{(0.082 atm.L/mol.K) \times 319 K} = 3.8 \times 10^{-14} mol$

Finally, we will convert 3.8 × 10⁻¹⁴ mol to molecules using Avogadro's number.

$3.8 \times 10^{-14} mol \times \frac{6.02 \times 10^{23} molecules }{mol} = 2.3 \times 10^{10} molecules$

SF₆ in the air at a concentration of 1.0 ppb, exerts a partial pressure of 1.0 × 10⁻⁹ atm. At this concentration, 2.3 × 10¹⁰ molecules of SF₆ are contained in 1.0 cm³ of air at 46 °C.

You can learn more about partial pressure here: brainly.com/question/13199169

6 0

3 years ago