Chemistry, 11.01.2021 04:30 lbshel08

10. How many moles of Ne are in a 0.50L tube at 200kPa and 50 °C? 11,60

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Answer from: Braxtonw875

0.04 mol Ne

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Chemistry

Gas Laws

Combined Gas Law: PV = nRT

P is pressure (in kPa)V is volume (in liters)n is amount of molesR is gas constant - $\displaystyle 8.314 \frac{kPa \cdot L}{mol \cdot K}$ T is temperature (in Kelvins)

Explanation:

Step 1: Define

P = 200 kPa

V = 0.50 L

T = 50°C

Step 2: Identify Conversions

Temperature Conversion: K = °C + 273.15

Step 3: Convert

Substitute T [TC]: K = 50°C = 273.15Add: K = 323.15

Step 4: Find Moles

Substitute [CBL]: $\displaystyle (200 \ kPa)(0.50 \ L) = n(8.314 \frac{kPa \cdot L}{mol \cdot K} )(323.15 \ K)$ Multiply: $\displaystyle 100 \ kPa \cdot L = n(2686.67 \frac{kPa \cdot L}{mol})$ Isolate n: $\displaystyle 0.037221 \ mol = n_{Ne}$ Rewrite: $\displaystyle n_{Ne} = 0.037221 \ mol$

Step 5: Check

Follow sig fig rules and round. We are given 1 sig figs as our lowest.

0.037221 mol Ne ≈ 0.04 mol Ne

Answer from: Quest

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

Answer from: Quest

the answer is na (sodium)

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10. How many moles of Ne are in a 0.50L tube at 200kPa and 50 °C? 11,60...