We can calculate the mass of an object using a ___

A box contains identical balls of which 12 are red, 18 white and 8 blue. Three balls are drawn from the box one after the other

svet-max [94.6K]

Answer:

a) 12/323

b) 8/233

Explanation:

a) The probability of a red ball being drawn is 12/38, or in a simplified fraction, 6/19. To find the probability that 3 are red you would multiply the probability of the fraction for each, except subtracting one from the total each time as the drawn is done without replacement. This is done as follows: 6/19 × 6/18 × 6/17= 12/323

b) The probability of drawing a blue ball is 8/38, or 4/19. To find that the first one is blue and the rest are red, the equation is done as follows: 4/19 × 6/18 × 6/17 = 8/233

(hopefully I did this right)

8 0

3 years ago

What tranports oxygen into the cells?

Ivenika [448]

Hemoglobin

The protein inside (a) red blood cells that carries oxygen to cells and carbon dioxide to the lungs is (b) hemoglobin

3 0

3 years ago

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will give brainliest!! please help ! .. Calculate the total pressure of the mixture in atmospheres ( atm ).

nordsb [41]

Answer:

13.94 atm

Explanation:

From the question given above, the following data were obtained:

Pressure of H₂ = 2 atm

Pressure of NH₃ = 303 KPa

Pressure of CO₂ = 3000 mmHg

Pressure of N₂ = 3800 torr

Total pressure (Pₜ) in atm =?

Next, we shall convert 303 KPa, 3000 mmHg and 3800 torr to atm.

This can be obtained as follow:

Converting 303 KPa to atm

101.325 KPa = 1 atm

Therefore,

303 KPa = 303 KPa × 1 atm / 101.325 KPa

303 KPa = 2.99 atm

Thus, 303 KPa is equivalent to 2.99 atm.

Converting 3000 mmHg to atm

760 mmHg = 1 atm

Therefore,

3000 mmHg = 3000 mmHg × 1 atm / 760 mmHg

3000 mmHg = 3.95 atm

Thus, 3000 mmHg is equivalent to 3.95 atm

Converting 3800 torr to atm

760 torr = 1 atm

Therefore,

3800 torr = 3800 torr × 1 atm / 760 torr

3800 torr = 5 atm

Thus, 3800 torr is equivalent to 5 atm.

Finally, we shall determine the total pressure of the mixture as follow:

Pressure of H₂ (P₁) = 2 atm

Pressure of NH₃ (P₂) = 2.99 atm

Pressure of CO₂ (P₃) = 3.95 atm

Pressure of N₂ (P₄) = 5 atm

Total pressure (Pₜ) in atm =?

Pₜ = P₁ + P₂ + P₃ + P₄

Pₜ = 2 + 2.99 + 3.95 + 5

Pₜ = 13.94 atm

Therefore, the total pressure of the mixture is 13.94 atm

4 0

3 years ago

A student creates a ball-and-stick model to represent the atomic scale of a substance. Which of the following best describes the

laila [671]

Answer is: A. 1 molecule with 10 atoms.
Every ball represent one atom in one molecule.
The ball and stick model is a molecular model of a chemical substance that shows the three-dimensional position of the atoms and the bonds between them. The atoms have spherical shape and they are connected with sticks (one, two or three, depends on bonds).

5 0

3 years ago

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what discovery led to the abandonment of the atomic mass as the determining factor for organizing elements in the periodic table

Ostrovityanka [42]

Answer:

A. isotopes

Explanation:

The periodic table was organized by Dimitry Mendeleiev by 1869, as he showed the connection between the atomic mass and the properties of the elements.

Nevertheless, the order of some few elements had to be altered because the properties did not follow the order of the atomic masses.

Henry Mosely by 1913 determined that atoms of a same element had different number of neutrons, leading to different atomic masses. These atoms of a same element (with the same number of protons) with different number of neutrons are known as isotopes.

By arranging the elements in increasing order of the number or protons (atomic number), instead of the atomic masses, all the elements resulted ordered according with a repetitive (periodic) pattern of chemical properties.

4 0

3 years ago

We can calculate the mass of an object using a ____