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3 years ago

What would be oil classification?

Chemistry

1 answer:

boyakko [2]3 years ago

8 0

The service rating of passengers car and commercial automotive motor oils

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How many atoms are included in a 12 gram sample of carbon 12

Karolina [17]

6.02 x 10^23, basically a mole since the molar mass of carbon is 12

3 0

4 years ago

The concentration of Pb²⁺ in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of t

svetoff [14.1K]

Answer:

0.005404 M

Explanation:

$Pb^{2+}(aq) + Na_{2}CO_{3}(aq) ---> PbCO_{3}(s) + 2Na^{+}(aq)$

Since you added an excess of sodium carbonate you warrantied that all the $Pb^{+2}$ in the sample reacted with it. So we can say that the insoluble lead (II) carbonate $PbCO_{3}$ contains all the $Pb^{+2}$ ions in the original sample.

The moles of $PbCO_{3}$ are:

$moles-of-PbCO_{3}=\frac{mass-of-PbCO_{3}}{Molecular-weight-of- PbCO_{3}}=\frac{0.1443g}{267\frac{g}{mol}}=0.00054 mol$

One mol of $Pb^{+2}$ is required to form one mol of $PbCO_{3}$ . So, the stoichiometric relationship between them is 1:1.

$Pb^{+2} +CO_{3}^{-2} - - - > PbCO_{3}$

Knowing this, 0.00054 is also the number of moles of $Pb^{+2}$ in the original sample.

So, the concentration of $Pb^{+2}$ in the original sample is:

$M = \frac{mol-of-Pb^{+2}}{volume-wastewater-(liters)}=\frac{0.00054}{0.1L}=0.005404 M$

8 0

4 years ago

A sample of gas has a volume of 526 mL at 346 mmHg and 35.0°C. Determine the moles of gas.

Furkat [3]

Answer:

The moles of gas is 0.009474 moles.

Explanation:

Given that,

Volume = 526 mL

Pressure = 346 mmHg

Temperature = 35.0°C

We need to calculate the moles of gas

Using formula of ideal gas

$n=\dfrac{PV}{RT}$

Where, P = pressure

V = volume

R = gas constant

T = temperature

Put the value into the formula

$n=\dfrac{\dfrac{346}{760}\times0.526}{0.08206\times(35+273)}$

$n=0.009474\ moles$

Hence, The moles of gas is 0.009474 moles.

7 0

3 years ago

Which of the following is NOT part of the kinetic molecular theory of gases?

kondaur [170]

A. There is very little empty space in a gas in not part of the kinetic molecular theory of gases.

Explanation:

The kinetic molecular theory of gases follows following points:

Kinetic energy does not change or get dissipated when gas molecules collide with each other. No attraction or repulsion between gas particles is observed. Particles of gas are moving randomly in all directions. Temperature increase cause the rapid movement of gas particles.The gas particles are placed very far from each other as compared to liquid.

The empty space in a gas is large because gas gets compressed in the small volume of the container also.

7 0

3 years ago

rewona [7]

The main author is Thomas Jefferson

8 0

3 years ago

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