a sample of gas at 25.0 c has a volume of 11.0 L and exerts a pressure of 660.0 mmHg. how many moles of gas are in the sample​

Answer:

If this is an idea gas then 1mol takes up 22.4L.

So, knowing how many L you have you can figure out how many  mole syou have by doing a simple equation:

[tex]\frac{1mol}{y} =\frac{22.4L}{925.4L}[/tex]

Solve for y.

Then, since you know how many moles you have use the ptable https://ptable.com/#Properties to figure out the mass in grams.

NOTE: The ptable tells you that 1mol of H = 1g.....so this should be an easy calculation :) enjoy

Answer:

I would choose pear fruits are a good source of carbohydrates hopefully its right sorry if its not

Answer: Fruit

Fruits have a lot of carbohydrates in them :) Hope this helped!

Answer:

There are needed 375mL of the 2.0M BaCl₂ solution completing to 500mL with water.

Explanation:

We can find with the volume and concentration of the barium chloride the moles of BaCl₂ required. With the moles and the concentration of our stock solution we can know the volume of the 2.0M BaCl₂ solution required as follows:

Moles required:

0.500L * (1.50mol / L) = 0.750 moles BaCl₂

Volume stock solution:

0.750 moles BaCl₂ * (1L / 2.0mol) = 0.375L

1 2 3 4 5 and how the question ask

Answer:

300

Explanation:

at least 300 molecules

Answer:

It would be a square plus b square and i am writing just so i can get pionts

Explanation:

Answer:

1) 5.0 mL, 4.0 mL, 3.0 mL and 2.0 mL respectively.

2) 3.0 mL

Explanation:

Hello there!

1) In this case, by considering that the equation we use for dilutions contain the initial and final concentrations and volumes:

[tex]C_1V_1=C_2V_2[/tex]

For the first four solutions, we compute the volume of the stock one (V1) as shown below:

[tex]V_1=\frac{C_2V_2}{C_1}[/tex]

Thus, we obtain:

[tex]V_1^1=\frac{3.5x10^{-5}M*10.00mL}{7.0x10^{-5}M} =5.0mL\\\\V_1^2=\frac{2.8x10^{-5}M*10.00mL}{7.0x10^{-5}M} =4.0mL\\\\V_1^3=\frac{2.1x10^{-5}M*10.00mL}{7.0x10^{-5}M} =3.0mL\\\\V_1^4=\frac{1.4x10^{-5}M*10.00mL}{7.0x10^{-5}M} =2.0mL[/tex]

2) In this case, for a final concentration of 2.1x10-5 M and a volume of 10.00 mL, the volume of the stock solution would be:

[tex]V_1=\frac{2.1x10^{-5}M*10.00mL}{7.0x10^{-5}M} =3.0mL[/tex]

Best regards!

Answer: The red on is attracted to The north pole

Explanation:

Answer:

Li⁺(aq) + 2Br⁻(aq) + Pb²⁺(aq) + NO₃⁻(aq) → PbBr₂(s) + NO₃⁻(aq) + Li⁺(aq)

A precipitate forms

Explanation:

To solve this question we must know the general solubility rules:

All group 1A (Li, Na, K...) and NH₄⁺ ions are always soluble.

The nitrates (NO₃⁻) and acetates are always solubles.

Cl⁻, Br⁻ and I⁻ are soluble except in the presence of Ag⁺, Pb²⁺, Cu⁺ and Hg₂²⁺

That means in the mixture of ions that we have, the Br⁻ will react with Pb²⁺ to produce PbBr₂(s):

i think A but if I'm wrong sorry

then if increasing then becoming spread out so letter A

Answer:

The answer of this question is A

Answer: B is the right

Explanation:

Answer: 1. Crest  2. Trough 3. Wave Length 4. Amplitude

Explanation:

Answer:

One of the most common methods used today to determine the composition of stars is spectroscopy.

Explanation:

Spectroscopy is the study of the interaction between matter and electromagnetic radiation as a function of the wavelength or frequency of the radiation.

Answer: 130 ppm Pb

Explanation:

We use parts per million to express the concentrations of solutions that contain very, very small amounts, often called trace amounts, of a given solute.

More specifically, a solution's concentration in parts per millions tells you the number of parts of solute present for every

10

6

=

1

,

000

,

000

parts of solution. You can thus say that a

1 ppm

solution will contain exactly

1 g

of solute for every

10

6

g

of solution.

In your case, you know that you have

38

mg Pb

⋅

1 g

10

3

mg

=

3.8

⋅

10

−

2

.

g Pb

in exactly

300.0 g

=

3.000

⋅

10

2

.

g solution

This means that you can use this known composition as a conversion factor to scale up the mass of the solution to

10

6

g

10

6

g solution

⋅

3.8

⋅

10

−

2

.

g Pb

3.000

⋅

10

2

g solution

=

130 g Pb

Since this represents the mass of lead present in exactly

10

6

g

of solution, you can say that the solution has a concentration of

concentration

ppm

=

130 ppm Pb

−−−−−−−−−−−−−−−−−−−−−−−−−−−−

The answer is rounded to two sig figs, the number of sig figs you have for the mass of lead present in the sample.

I think producer

option is A

Answer:

B. Producer

Explanation:

A producer is normally a type of plant which is food for the animals. Decomposers are things that decompose dead living things into nutrients and etc. Consumers are the ones who normally feed on producers in the food web and are small animals.

Answer: the density is 997 kg

Explanation:

Answer:

d. 12.3 grams of Al2O3

Explanation:

The balanced equation in this question is as follows:

4Al + 3O2 → 2Al2O3

In this equation above, 4 moles of Al produces 2 moles of Al2O3

However, the moles of Al2O3 must first be found using;

mole = mass/molar mass

Molar mass of Al = 27g/mol

mole = 6.50/27

= 0.241mol of Al.

Hence, if 4 moles of aluminum (limiting reagent) reacts to form 2 moles of aluminum oxide (Al2O3).

Then, 0.241mol of Al will produce (0.241 × 2/4) = 0.241/2 = 0.121mol of Al2O3.

Convert this mole value to molar mass using mole = mass/molar mass

Molar mass of Al2O3 = 27(2) + 16(3)

= 54 + 48

= 102g/mol

mass = molar mass × mole

mass = 102 × 0.121

mass of Al2O3 = 12.34grams.

Answer:

Calorie

Explanation:

This can mesure thermal energy

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

net force = 2400 × 3.6

We have the final answer as

Hope this helps you

Answer:Divergent Boundaries(or Boundary)

Explanation:took the test and got it right

Answer:

A. 1147.44 grams

Explanation:

Multiply volume by molarity to get the moles of solution.

5.85 M = mol/2.0 L

mol = (5.85 M)(2.0 L)

mol = 11.7

There is 11.7 moles of H2SO4.

Convert to grams with molar mass.

11.7 mol H2SO4 x (98.076 g/1 mol) = 1147.49 g

Closest answer is A, 1147.44 g.

Answer:

An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.

Answer:

Argon

Explanation:

Because, it is positioned down on the periodic table

Answer:

Argon

Explanation:

Answer:

ionic --complete transferring

covalent--- sharing of electron

metallic bonding--- occurs between free electrons and metal ions.

Explanation:

In ionic bond, the electrons transfer from one atom to another atom. The atom which loses electrons is known as donor whereas the atom which accept electrons is known as acceptor. In covalent bond, atoms share electrons mutually means both atoms donate their electrons and no one loses their electrons, it can only be shared. Metallic bonding refers to the type of bonding in which electrostatic attractive force present between free electrons  and positively charged metal ions.

Answer:

cell, nucleus , chromosome, DNA, gene

Answer:

Here we were given the weight of Ca as 80g

and the atomic mass of carbon is 40u(molar mass)

using the formula

where w is weight and m is molar mass

80/40

=2

therefore, there are 2 moles in 80g of calcium