The amount of light that reaches the detector can be reduced by scuffs and fingerprints on the surface of the cell. Your results won't be correct if this happens.

To measure the concentration of a particular solution precisely, this equipment requires cautious usage. If certain preparatory processes weren't followed, the wavelength could be off.

Always use a lint-free cloth to clean or manipulate the cuvette, and be careful to wipe out any water that may have accidentally dropped inside.

Although each fingerprint is unique, they all fall into one of three main categories: the whorl, which resembles a spiral, the loop, which resembles a teardrop, and the arch, which resembles a cross-section of a hill.

Learn more about fingerprints:

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1 year ago

How many molecules are present in 98.2g of NaNO3

I am Lyosha [343]

<h3>Answer:</h3>

6.96 × 10²³ molecules NaNO₃

<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>

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

<h3>Explanation:</h3>

<u>Step 1: Define</u>

98.2 g NaNO₃

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

Avogadro's Number

Molar Mass of Na - 22.99 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of NaNO₃ - 22.99 + 14.01 + 3(16.00) = 85.00 g/mol

<u>Step 3: Convert</u>

Set up: $\displaystyle 98.2 \ g \ NaNO_3(\frac{1 \ mol \ NaNO_3}{85.00 \ g \ NaNO_3})(\frac{6.022 \cdot 10^{23} \ molecules \ NaNO_3}{1 \ mol \ NaNO_3})$
Multiply: $\displaystyle 6.95718 \cdot 10^{23} \ molecules \ NaNO_3$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

6.95718 × 10²³ molecules NaNO₃ ≈ 6.96 × 10²³ molecules NaNO₃

6 0

3 years ago