How many grams of co are in 125 ml of a 0.25 m solution? 0.87 g 1.1 g 14 g 880 g?

1 answer:

6 0

The number of grams of Co that are in 125 Ml of 0.25 M solution is 0.87 grams

calculation
find the number of moles
moles= molarity x volume in liters
volume in liters = 125/1000 = 0.125 L
molarity = 0.25 M

moles is therefore = 0.125 x 0.25=0.0313 moles
mass = moles x molar mass

molar mass of Co= 12 +16 =28g/mol

mass is therefore = 28 g/mol x0.0313 moles= 0.87 grams

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How many moles are in 8.63 x 103 atoms of Li?

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<h3>Answer:</h3>

1.43 × 10⁻²⁰ mol Li

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<h3>Explanation:</h3>

<u>Step 1: Define</u>

8.63 × 10³ atoms Li

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

Set up: $\displaystyle 8.63 \cdot 10^3 \ atoms \ Li(\frac{1 \ mol \ Li}{6.022 \cdot 10^{23} \ atoms \ Li})$
Multiply/Divide: $\displaystyle 1.43355 \cdot 10^{-20} \ moles \ Li$