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3 years ago

What is the mass of 2 moles of 238 u?

Chemistry

2 answers:

Ad libitum [116K]3 years ago

5 0

<span>use this formula mass = moles x molar mass</span>

Lana71 [14]3 years ago

3 0

Answer:

Mass of 2 moles of $^{238}\textrm{U}$ is 476.1 g

Explanation:

We know that number of moles of an atom is ratio of mass of the atom to it's atomic weight.
Atomic weight of $^{238}\textrm{U}$ is 238.05 g/mol
So, mass of 1 mol of $^{238}\textrm{U}$ atom is 238.05 g
Hence mass of 2 moles of $^{238}\textrm{U}$ = $(2mol\times 238.05g/mol)=476.1 g$

Hence mass of 2 moles of $^{238}\textrm{U}$ is 476.1 g

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Identify the products in the following chemical resction 2NaHCO3 + CaCI2 --> CaCO3 + CO2 + 2NaCI + H2O

Radda [10]

the products are:

CaCO3 Calcium Carbonate

CO2 carbon dioxide

NaCI Sodium chloride

H2O Water

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3 years ago

Why do different molecules require different masses to make 1 mol

Wewaii [24]

Answer:

Different substances have different molecular masses. Thus, equal masses have different numbers of atoms, molecules, or moles. On the other hand, equal numbers of moles of different substances have different masses.

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3 years ago

Based on their electrons dot diagrams, what is the formula for the covalently bonded compound

Luda [366]

Answer:

Nitrogen, the next nonmetal, has 5 electrons in the valence shell, so it needs to combine with 3 hydrogen atoms to fulfill the octet rule and form a stable compound called ammonia (NH3).

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2 years ago

What is the molarity of a solution that contains 15.0g of naoh per 500.0 ml of solution

VARVARA [1.3K]

Answer:

0.4 M

Explanation:

Molarity is defined as moles of solute, which in your case is sodium hydroxide,

NaOH

, divided by liters of solution.

molarity

moles of solute

liters of solution

Notice that the problem provides you with the volume of the solution, but that the volume is expressed in milliliters,

Moreover, you don't have the number of moles of sodium hydroxide, you just have the mass in grams. So, your strategy here will be to

determine how many moles of sodium hydroxide you have in that many grams

convert the volume of the solution from milliliters to liters

So, to get the number of moles of solute, use sodium hydroxide's molar mass, which tells you what the mass of one mole of sodium hydroxide is.

⋅

1 mole NaOH

40.0

0.175 moles NaOH

The volume of the solution in liters will be

500

⋅

1 L

1000

0.5 L

Therefore, the molarity of the solution will be

0.175 moles

0.5 L

0.35 M

Rounded to one sig fig, the answer will be

0.4 M

8 0

3 years ago

17. If 5.00 L of an ideal gas is cooled from 24°C to - 27000

Elina [12.6K]

Answer:

V₂ = 448.44 L

Explanation:

Given data:

Initial volume = 5.00 L

Initial temperature = 24°C

Final volume = ?

Final temperature = -27000°C

Solution:

Final temperature = -27000 + 273 = 26727 K

Initial temperature = 24 +273 = 297 K

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁

V₂ = 5.00 L × 26727 K / 297 k

V₂ = 133635 L.K / 298 K

V₂ = 448.44 L

8 0

3 years ago