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kati45 [8]
4 years ago
14

3. What was your average percent error for all three trials? In this experiment you did three trials. Why was it suggested that

you do three trials and not fewer?
Chemistry
2 answers:
sweet [91]4 years ago
7 0

Answer:

To be sure of the value you will obtain

Explanation:

Trial 1

Mass of calorimeter: 409g

Temp of calorimeter: 20Cº

Mass of calorimeter + water: 457g

Temp of calorimeter + water: 20Cº

Mass of calorimeter + water + ice: 510g

Temp of calorimeter + water + ice: –

Mass of calorimeter + ice: 450g

Temp of calorimeter + ice: 0Cº

Trial 2

Mass of calorimeter: 409g

Temp of calorimeter: 20Cº

Mass of calorimeter + water: 461g

Temp of calorimeter + water: 22Cº

Mass of calorimeter + water + ice: 515g

Temp of calorimeter + water + ice: –

Mass of calorimeter + ice: 447g

Temp of calorimeter + ice: 0Cº

Trial 3

Mass of calorimeter: 409g

Temp of calorimeter: 20Cº

Mass of calorimeter + water: 459g

Temp of calorimeter + water: 22Cº

Mass of calorimeter + water + ice: 513g

Temp of calorimeter + water + ice: –

Mass of calorimeter + ice: 448g

Temp of calorimeter + ice: 0Cº

stira [4]4 years ago
6 0

To be sure of the value you will obtain

Explanation:

Trial 1Mass of calorimeter: 409gTemp of calorimeter: 20CºMass of calorimeter + water: 457gTemp of calorimeter + water: 20CºMass of calorimeter + water + ice: 510gTemp of calorimeter + water + ice: –Mass of calorimeter + ice: 450gTemp of calorimeter + ice: 0Cº

Trial 2Mass of calorimeter: 409gTemp of calorimeter: 20CºMass of calorimeter + water: 461gTemp of calorimeter + water: 22CºMass of calorimeter + water + ice: 515gTemp of calorimeter + water + ice: –Mass of calorimeter + ice: 447gTemp of calorimeter + ice: 0Cº

Trial 3Mass of calorimeter: 409gTemp of calorimeter: 20CºMass of calorimeter + water: 459gTemp of calorimeter + water: 22CºMass of calorimeter + water + ice: 513gTemp of calorimeter + water + ice: –Mass of calorimeter + ice: 448gTemp of calorimeter + ice: 0Cº

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Of the following gases, ________ will have the greatest rate of effusion at a given temperature. Of the following gases, _______
kolezko [41]

<u>Answer:</u> From the given gases, the greatest rate of effusion is of CH_4

<u>Explanation:</u>

Rate of effusion of a gas is determined by a law known as Graham's Law.

This law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}

It is visible that molar mass is inversely related to rate of effusion. So, the gas having lowest molar mass will have the highest rate of effusion.

For the given gases:

Molar mass of NH_3=17g/mol

Molar mass of HCl=36.5g/mol

Molar mass of CH_4=16g/mol

Molar mass of Ar=40g/mol

Molar mass of HBr=81g/mol

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If we wish to prepare 250. mL of 0.200 M BaCl2 solution, how much solid BaCl2 is needed?
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Explanation are in the Picture

8 0
3 years ago
(e) A 0.050 mol sample of a hydrocarbon was burned in excess oxygen.
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The correct answer is 0.15.

We are aware that there is 0.05 mol of an unidentified hydrocarbon we will refer to as "X" and that its burning produces 6.6 g of carbon dioxide and 3.6 g of water.

These quantities might be converted to moles by applying the following formula:

amount= mass/ relative atomic mass

Thus, the following equation may be written for H2O: moles = 3.6 / 18 = 0.2 and for CO2: moles = 6.6 / 44 = 0.15.

0.05X + x'O2 = 0.15CO2 + 0.2H2O

This may be made simpler by dividing through by 0.05 (this step is likely to be the most helpful to you), resulting in:

1 x + x O2 = 3 co2 + 4 H2O

The hydrocarbon must have been the source of all the carbon in the carbon dioxide and all the hydrogen in the water.

Accordingly, 4 x 2 = 8 moles of H and 3 x 1 = 3 moles of C.

There are 3/1 = 3 Cs and 8/1 = 8 Hs in one X molecule.

This clearly identifies C3H8 or propane as the hydrocarbon X (dividing by 1 seems unnecessary, but it illustrates the process to use if there were more than one mol of X in the first equation).

To learn more about number of moles of carbon dioxide refer the link:

brainly.com/question/12723070

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