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solniwko [45]
4 years ago
11

HELP ME QUICK

Chemistry
2 answers:
kozerog [31]4 years ago
5 0

The answer is A. Heat is released.

I hope that this helps!

Sophie [7]4 years ago
3 0
Quick answer: Exothermic reactions mean that heat has escaped the system. The answer is A. Heat is released.
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6.) 50.0 mol H2O<br> ? molecules
8_murik_8 [283]
<h3>Answer:</h3>

3.01 × 10²⁵ molecules H₂O

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. 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>

50.0 mol H₂O

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

Avogadro's Number

<u>Step 3: Convert</u>

<u />\displaystyle 50.0 \ mol \ H_2O(\frac{6.022 \cdot 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O} ) = 3.011 × 10²⁵ molecules H₂O

<u>Step 4: Check</u>

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

3.011 × 10²⁵ molecules H₂O ≈ 3.01 × 10²⁵ molecules H₂O

5 0
3 years ago
How many atoms are present in 2.1 moles of Fe
Lyrx [107]

Answer:

1.3 x 10²⁴ atoms Fe

Explanation:

To convert moles to atoms, you need to multiply your given value by Avogadro's Number. This causes the conversion to occur because Avogadro's Number exists as a ratio. It is the ratio that allows for the cancellation of units during multiplication. This is why atoms should be in the numerator of your conversion. The final answer should have 2 sig figs to reflect the given value.

Avogadro's Number:

1 mole = 6.022 x 10²³ atoms

2.1 moles Fe          6.022 x 10²³ atoms
---------------------  x  -------------------------------  =  1.3 x 10²⁴ atoms Fe
                                        1 mole

4 0
2 years ago
Which part of the atom cannot have its location accurately determined and is modeled by a cloud around the center of the
Vesnalui [34]

Answer:

the electron

Explanation:

4 0
3 years ago
If an object loses electrons it will become negatively charged. <br><br><br> True<br><br> False
Ray Of Light [21]
The answer should be true.
3 0
4 years ago
What does conserving mass mean in a chemical equation?
Keith_Richards [23]
The answer would be C. Hope this helps
4 0
3 years ago
Read 2 more answers
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