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3 years ago

What is density? How do you find it?

Chemistry

1 answer:

Assoli18 [71]3 years ago

5 0

Density is the measure of a mass per unit volume of a material substance

density= Mass/volume

The unit of density is g/cm^3

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How many moles of CH3CH2Br are contained in 422 mL of 0.0950 M CH3CH2Br solution?

allochka39001 [22]

M= moles/L

422mL = 422/1000 = 0.422 L

0.0950 M = ? moles / 0.422 L
0.0950 Moles/ L X 0.422 L = 0.0401 moles

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2 years ago

Which form of bonding holds cesium chloride (CsCl) together?

Talja [164]

The correct answer is D. Cesium chloride is held together by ionic bonding. This substance is a salt like sodium chloride. It is also soluble in water. When it dissociates, it forms into cesium ions and chloride ions.

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4 years ago

Record the temperature shown on the thermometer to the nearest half of a degree.

Lina20 [59]

Answer:

22.5

Explanation:

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3 years ago

Read 2 more answers

Why do nuclear reactions take place

jolli1 [7]

Answer:

Nuclear reaction occurs when an elementary particle or another nucleus has enough energy to disturb internal structure of a bombarded nucleus to such a level that it undergoes a transition to a different state.

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4 years ago

How many moles are in 1.51x10^26 atoms of xenon (Xe)? Please and thank you :)!!

RoseWind [281]

<h3>Answer:</h3>

251 mol Xe

<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>

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

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

[Given] 1.51 × 10²⁶ atoms Xe

[Solve] moles Xe

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

Avogadro's Number

<u>Step 3: Convert</u>

[DA] Set up: $\displaystyle 1.51 \cdot 10^{26} \ atoms \ Xe(\frac{1 \ mol \ Xe}{6.022 \cdot 10^{23} \ atoms \ Xe})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 250.747 \ mol \ Xe$

<u>Step 4: Check</u>

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

250.747 mol Xe ≈ 251 mol Xe

3 0

3 years ago