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3 years ago

Which is a postulate of the kinetic-molecular theory?

2 answers:

8 0

An increase in the number of gas particles in the container increases the frequency of collisions with the walls and therefore the pressure of the gas. The last postulate of the kinetic molecular theory states that the average kinetic energy of a gas particle depends only on the temperature of the gas.

Sladkaya [172]3 years ago

7 0

Answer:

Gas particles have a small volume relative to the spaces between them.

Explanation: There is a lot of empty space between the gas molecules which accounts in the final volume.

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How many mL of a 0.250M sodium hydroxide solution is needed to neutralize 25.0 mL of a 0.430M sulfuric acid solution?

kotykmax [81]

Answer:

86.0 mL

Explanation:

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2 years ago

What is the mole ratio needed to determine the mass of phosphorus trifluoride produced from the reaction of 120 g of phosphorus

Vitek1552 [10]

Answer:

$\frac{4molPF_3}{1molP_4}$

Explanation:

Hello

In this case, given the reaction:

$P_4(s)+6F_2(g)\rightarrow 4PF_3(g)$

It means that since the coefficients preceding phosphorous and phosphorous trifluoride are 1 and 4, the correct mole ratio should be:

$\frac{4molPF_3}{1molP_4}$

Because given the mass of phosphorous it is convenient to convert it to moles and then cancel it out with the moles on bottom of the mole ratio.

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2 years ago

If you have 6.25g of O2, how many moles of H2O are produced?

denis23 [38]

Answer:

0.4 moles of water produced by 6.25 g of oxygen.

Explanation:

Given data:

Mass of oxygen = 6.25 g

Moles of water produced = ?

Solution:

Chemical equation;

2H₂ + O₂ → 2H₂O

Number of moles of oxygen:

Number of moles = mass/ molar mass

Number of moles = 6.35 g/ 32 g/mol

Number of moles = 0.2 mol

Now we will compare the moles of oxygen with water:

O₂ : H₂O

1 : 2

0.2 : 2×0.2 = 0.4 mol

0.4 moles of water produced by 6.25 g of oxygen.

8 0

2 years ago

A 298 lb person must receive Heparin, determine the number of units given every hour (Heparin 8.0 units/kg per hour). Enter your

yarga [219]

Answer:

1,081.1 units of heparin should be given to 298 lb person.

Explanation:

We are given:

Weight of the person = 298 lb = 135.143 kg

Conversion factor used:

1 lb = 0.4535 kg

Number of unit of heparin to be given in an hour = 8.0 units/kg

Number of units given to the patient weighing 135.143 kg :

$8.0 units/kg\times 135.143 kg=1,081.144 units\approx 1,081.1 units$

1,081.1 units of heparin should be given to 298 lb person.

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2 years ago

A certain plant requires moisture oxygen carbon dioxide light and minerals in order to survive.This statement describes a living

TEA [102]

The Answer is C. Abiotic Factors

3 0

2 years ago