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emmainna [20.7K]
3 years ago
11

What is the correct wat towrite 0.0000250 m kn scientific notation?

Chemistry
2 answers:
ahrayia [7]3 years ago
5 0

2.5x-10^5

hope this helped ^_^

SVETLANKA909090 [29]3 years ago
4 0

Answer:

2.50 × 10⁻⁵  m

Explanation:

A number in scientific notation has the form A × 10ⁿ.

A is a number from 1 to 10, but not 10 itself and is called the <em>coefficient</em>.

n is an integer and is called the <em>exponent</em>.

To convert a small decimal number to exponential notation, you move the decimal point to the right until you have one nonzero digit in front of the decimal point.

The exponent is negative of the number of places you moved the decimal point.  

To convert 0.000 0250 m to scientific notation:

Move the decimal point to the right until it is just past the 1. The coefficient is 2.50

Count the number of places you have moved the decimal (5). The exponent is -5.

The number in scientific notation is 2.50 × 10⁻⁵.

Add the units and the measurement is 2.50 × 10⁻⁵ m.

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Explanation:

133.4g of MgBr2 dissolves in 1.84L of water.

Therefore Xg of MgBr2 will dissolve in 1L of water. i.e

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The concentration of MgBr2 is 72.5g/L = 0.0725mg/L

Recall,

1mg/L = 1ppm

Therefore, 0.0725mg/L = 0.0725ppm

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How many moles of nitrate are dissolved in water if 6.15 mole strontium nitrate dissolve?
pashok25 [27]

The number of moles of nitrate dissolved in water if 6.15 mole of strontium nitrate is :   12.3 moles

<u>Given data :</u>

Moles of strontium nitrate = 6.15 moles

<h3>Ionization of Strontium Nitrate </h3>

When strontium nitrate ( Sr(NO_{3} )_{2} ) is placed in water it will dissociates into its ions because strontium nitrate is an ionic compound.

Next step : Represent the ionization of strontium nitrate

Sr ( NO_{3} )_{2}  (aq) --- > Sr^{2+} (aq)  + 2NO_{3} ^{-} (aq)

From the Stoichiometry of the chemical reaction

I mole of strontium nitrate =  2 moles of Nitrate ions

6.15 mole of strontium nitrate = 2 * 6.15

                                                 = 12.3 moles of Nitrate

Hence we can conclude that The number of moles of nitrate dissolved in water if 6.15 mole of strontium nitrate is :   12.3 moles.

Learn more about Stoichiometry of chemical reaction : brainly.com/question/27058367

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3 years ago
Chemical analysis shows that citric acid contains 37.51% C, 4.20% H, and 58.29% O. What is the empirical formula for citric acid
Fiesta28 [93]

The empirical formula for the citric acid is C₆H₈O₇

<h3>Data obtained from the question </h3>
  • Carbon (C) = 37.51%
  • Hydrogen (H) = 4.20%
  • Oxygen (O) = 58.29%
  • Empirical formula =?

Divide by their molar mass

C = 37.51 / 12 = 3.126

H = 4.2 / 1 = 4.2

O = 58.29 / 16 = 3.643

Divide by the smallest

C = 3.126 / 3.126 = 1

H = 4.2 / 3.126 = 1.34

O = 3.643 / 3.126 = 1.17

Multiply through by 6 to express in whole number

C = 1 × 6 = 6

H = 1.34 × 6 = 8

O = 1.17 × 6 = 7

Thus, the empirical formula for the citric acid is C₆H₈O₇

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