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2 years ago

5

Seawater is mostly a solution of sodium chloride in water. The concentration varies, but marine biologists took a sample with an

amount concentration of 0.56 mol/L. Calculate the mass of sodium chloride in the biologists 5.0L

1 answer:

sineoko [7]2 years ago

3 0

Answer:

1.0.16

2.a.355mg

b. 8.07mmol/L

3.7.83%

Explanation:

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Given the following unbalanced equation:

antiseptic1488 [7]

<h3>Answer:</h3>

11.84 mol CoF₂

<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> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

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<u>Step 1: Define</u>

[RxN - Unbalanced] CoCl₂ + F₂ → CoF₂ + Cl₂

[RxN - Balanced] CoCl₂ + F₂ → CoF₂ + Cl₂

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[Solve] moles CoF₂

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

[RxN] 1 mol CoCl₂ → 1 mol CoF₂

<u>Step 3: Stoich</u>

[DA] Set up: $\displaystyle 11.84 \ mol \ CoCl_2(\frac{1 \ mol \ CoF_2}{1 \ mol \ CoCl_2})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 11.84 \ mol \ CoF_2$

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A serving of Cheez-Its releases 130 kcal (1 kcal = 4.18 kJ) when digested by your body. If this same amount of energy were trans

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The final temperature : 78.925°C

<h3>Further explanation </h3>

Heat can be calculated using the formula:

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Q = heat, J

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c = specific heat, joules / g ° C

∆T = temperature difference, ° C / K

Energy releases = 130 kcal = 130 x 4.18 kJ=543.4 kJ

The final temperature :

$\tt \Delta T=\dfrac{Q}{m.c}\\\\\Delta T=\dfrac{543.4}{2.5\times 4.186~kJ/kg^oC}\\\\\Delta T=51.925^oC$

Final temperature :

ΔT=final-initial

51.925°c=final-27°c

final = 51.925+27=78.925°C

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Explanation:

Mg + <u>2</u>HNO2 → Mg(NO2)2 + H2

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Answer:

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