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3 years ago

What elements mass number is 15

Chemistry

2 answers:

mariarad [96]3 years ago

8 0

Phosphorus have mass number of 15

Paraphin [41]3 years ago

3 0

Phosphorus has an atomic mass of 15

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When 20.0 mL of an acetic acid (CH3COOH) solution is titrated with a 0.0610 M sodium hydroxide (NaOH) solution, the equivalence

Zolol [24]

Answer:

Solution that is 0.100 M CH3COOH (acetic acid)

and 0.100 M NaCH3COO (sodium acetate)

Find pH of buffer solution:

CH3COOH(aq) + H2O ↔ CH3COO-

(aq) + H3O+(aq)

[CH3COOH] [CH3COO-

] [H3O+]

initial 0.100 0.100 ≈0

-x x x

equil 0.100 – x 0.100 + x xFind pH of buffer solution:

CH3COOH(aq) + H2O ↔ CH3COO-

(aq) + H3O+(aq)

Ka = [CH3COO-

][H3O+

]

[CH 3COOH] = (.100 + x)x

(.100 - x) = 1.8 x 10-5

x = 1.80 x 10-5 M

pH = 4.7

Explanation:

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3 years ago

Perform the calculation and report the answer using the proper number of significant figures. Make sure the answer is rounded co

shusha [124]

This question is an incomplete question, here is a complete question.

Perform the following calculation. Report the answer using the proper number of significant figures.

$\frac{1.012\times 10^{-3}J}{(0.025456g)\times (298.3682-298.3567)K}=?$

Answer : The answer will be, $3.46J/g.K$

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule apply for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The rule apply for the addition and subtraction is :

The least precise number present after the decimal point determines the number of significant figures in the answer.

The given expression is,

$\frac{1.012\times 10^{-3}J}{(0.025456g)\times (298.3682-298.3567)K}$

$\frac{1.012\times 10^{-3}J}{(0.025456g)\times (0.0115)K}$

$\Rightarrow 3.4569J/g.K$

In the given expression, 1.012 has 4 significant figures, 0.025456 has 5 significant figures and 0.0115 has 3 significant figures. From this we conclude that 3 is the least significant figures in this problem. So, the answer should be in 3 significant figures.

Thus, the answer will be $3.46J/g.K$

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3 years ago

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Inessa05 [86]

Pretty sure the answer is D.

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Anastaziya [24]

Chemically bonded together

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3 years ago

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creativ13 [48]

Answer:

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Explanation:

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3 years ago