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Kazeer [188]
2 years ago
13

How many significant figures are contained in each of the following measurements?

Chemistry
2 answers:
kakasveta [241]2 years ago
7 0

Answer:

(a) 53 cm  --> 2 significant figures.

(b) 2.05 x10² m  --> 3 significant figures.

(c) 86,002J  --> 5 significant figures.

(d) 9.740 x 10⁴ m/s  --> 4 significant figures.

(e) 10.0613 m³  --> 6 significant figures.

(f) 0.17 g/mL  --> 2 significant figures.

(g) 0.88400 s --> 5 significant figures.

Explanation:

Hello,

By considering the following widely rules to determine a measurement's significant figures:

1. Non-zero digits are always taken as significant.

2. All zeros between two significant digits are taken as significant.

3. A final zero or trailing zeros in the decimal portion ONLY are significant.

The significant figures of each case are provided as shown below:

(a) 53 cm  --> 2 significant figures.

(b) 2.05 x10² m  --> 3 significant figures.

(c) 86,002J  --> 5 significant figures.

(d) 9.740 x 10⁴ m/s  --> 4 significant figures.

(e) 10.0613 m³  --> 6 significant figures.

(f) 0.17 g/mL  --> 2 significant figures.

(g) 0.88400 s --> 5 significant figures.

Best regards.

Nina [5.8K]2 years ago
5 0
A) 2
B) 3
C) 5
D) 4
E) 6
F) 2
G) 5
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The given concentration of boric acid = 0.0500 M

Required volume of the solution = 2 L

Molarity is the moles of solute present per liter solution. So 0.0500 M boric acid has 0.0500 mol boric acid present in 1 L solution.

Calculating the moles of 0.0500 M boric acid present in 2 L solution:

2 L * \frac{0.0500 mol B(OH)_{3} }{1 L} = 0.100 mol B(OH)_{3}

Converting moles of boric acid to mass:

0.100 mol B(OH)_{3} * \frac{61.83 g}{mol B(OH)_{3}}   = 6.183 g

Therefore, 6.183 g boric acid when dissolved and made up to 2 L with distilled water gives 0.0500 M solution.


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2 years ago
Water treatment plants commonly use chlorination to destroy bacteria. a byproduct is chloroform (chcl3), a suspected carcinogen
antiseptic1488 [7]
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number of moles of solute = mass of CHCl3 / molar mass of CHCl3

molar mass of CHCl3 = 119.37 g/mol

number of moles of solute = 100 g / 119.37 g/mol = 0.838 mol

using density of water = 1 g/ ml => 1,000,000,000 g = 1,000,000 liters

M = 0.838 / 1,000,000 = 8.38 * 10^ - 7 M <----- answer

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number of moles of solute = 0.838

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m = 0.838 moles / 1,000,000 kg = 8.38 * 10^ - 7 m <----- answer

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X solute = number of moles of solute / number of moles of solution

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number of moles of solvent = mass of water / molar mass of water = 1,000,000,000 g / 18.01528 g/mol = 55,508,435 moles

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\ln P = \dfrac{-\Delta{H_{vap}}}{RT} + c

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c is the constant.

For two situations and phases, the equation becomes:

\ln \left( \dfrac{P_1}{P_2} \right) = \dfrac{\Delta H_{vap}}{R} \left( \dfrac{1}{T_2}- \dfrac{1}{T_1} \right)

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P_1 = 13.95 torr

P_2 = 144.78 torr

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T(K) = T( °C) + 273.15  

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T = (25 + 273.15) K = 298.15 K

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\ln \:\left(\:\frac{13.95}{144.78}\right)\:=\:\frac{\Delta \:H_{vap}}{8.314}\:\left(\:\frac{1}{348.15}-\:\frac{1}{298.15}\:\right)

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4 0
2 years ago
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Mademuasel [1]

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A nuclear reactor is hence an equipment where nuclear chain reactions occur and control can be obtained. The nuclear reactor uses mostly uranium-235 and Plutonium-239. When these radioactive substances absorbs neutrons, they undergo nuclear fission causing the nucleus to split into two or more smaller compounds with  the release of kinetic energy a form of mechanical energy, gamma radiations and others.The kinetic energy is then harnessed in the equipment as heat (thermal energy) which is received by a cooling system and steam is generated. The steam can then power the generator from which electricity is obtained (electrical energy).

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