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3 years ago

NEEED!! HELP!!!

Chemistry

2 answers:

Free_Kalibri [48]3 years ago

6 0

C. Is the answer. Mark brainliest.

sweet [91]3 years ago

4 0

high specific heat capacity means water stores a lot of heat

when it is hot outside, water stores the heat, causing it to not be as hot as it could be without water

when it is cold outside, the heat from inside the water is transfered outside so that the temperature isn't as cold as it could be

so A and B are wrong (opposite)

In the case of internal temperature, the high specific heat of water should prevent variation, but I'm not too sure

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The equation for the combustion of CH4 (the main component of natural gas) is

Lera25 [3.4K]

Heat produced = -13588.956 kJ

<h3>Further explanation</h3>

Given

The reaction of combustion of Methane

CH4(g)+2O2(g)→CO2(g)+2H2O(g) ΔH∘rxn=−802.3kJ

271 g of CH4

Required

Heat produced

Solution

mol of 271 g CH₄ (MW=16 g/mol0

mol = mass : MW

mol = 271 : 16

mol = 16.9375

So Heat produced :

= mol x ΔH°rxn

= 16.9375 mol x −802.3kJ/mol = -13588.956 kJ

6 0

3 years ago

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

Ira Lisetskai [31]

<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: $\displaystyle 1.43355 \cdot 10^{-20} \ moles \ Li$

<u>Step 4: Check</u>

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

1.43355 × 10⁻²⁰ mol Li ≈ 1.43 × 10⁻²⁰ mol Li

4 0

2 years ago

Pls answer I am giving lots of points and need all the work shown. Determine the kb for chloroform when 0.793 moles of solute in

navik [9.2K]

Answer:0.87

Explanation:

8 0

3 years ago

What is the oxidation state of nitrogen in a nh4f molecule

joja [24]

Answer:

Explanation:

NH₄F

=> N + 4H + F = 0

=> N + 4(+1) + 1(-7) = 0

=> N = 7 - 4 = +3

8 0

3 years ago

Help, also brainly dont be mean and delete this.

n200080 [17]

Answer:

I dont understand what is the question you need help on-

Explanation:

8 0

3 years ago