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Crank
3 years ago
14

Hich of the following statements is true about what happens during a chemical reaction?

Chemistry
1 answer:
postnew [5]3 years ago
6 0
I believe it is <span>d. the bonds of both the reactants and the products are formed.</span>
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Calculate the atomic mass of Carbon if the two common isotopes of carbon have masses of
Mars2501 [29]

Answer:

Average atomic mass of carbon = 12.01 amu.

Explanation:

Given data:

Abundance of C¹² = 98.89%

Abundance of C¹³ = 1.11%

Atomic mass of C¹² = 12.000 amu

Atomic mass of C¹³ = 13.003 amu

Average atomic mass = ?

Solution:

Average atomic mass of carbon = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass of carbon = (12.000×98.89)+(13.003×1.11) /100

Average atomic mass of carbon=  1186.68 + 14.43333 / 100

Average atomic mass of carbon = 1201.11333 / 100

Average atomic mass of carbon = 12.01 amu.

5 0
3 years ago
Please I need help with this question.​
7nadin3 [17]

Answer:

c?

Explanation:

7 0
2 years ago
Read 2 more answers
How many kj of heat are needed to completely melt 32.3 g of h2o, given that the water is at its melting point? the heat of fusio
timurjin [86]

Answer: fourth option, 10.8 kJ


Explanation:


The <em>heat of fusion</em>, also named latent heat of fusion, is the amount of heat energy required to change the state of a substance from solid to liquid (at constant pressure).


The data of the <em>heat of fusions</em> of the substances are reported in tables and they can be shown either per mole or per gram of substance.


In this case we have that the<em> heat of fusion for water </em>is reported per mole: <em>6.02 kJ/mole</em>.


The formula to calculate <em>how many kJ of heat (total heat) are needed to completely melt 32.3 g of water, given that the water is at its melting point</em> is:

  • Heat = number of moles × heat of fusion

The calculations are:

  • number of moles = mass / molar mass

        number of moles = 32.3 g / 18.015 g/mol = 1.79 mol

       

  • Heat = 1.79 mol × 6.02 kJ / mol = 10.8 kJ ← answer
5 0
3 years ago
Read 2 more answers
What is true about the element calcium(Ca, atomic number 20)? Choose all that apply.
Marat540 [252]
It has 2 valence electrons

THANK ME
7 0
3 years ago
Read 2 more answers
How many atoms of Hydrogen in the products of the following equation?
love history [14]

Answer:

2 atoms of H in the products side

Explanation:

3NO₂ + H₂O → NO + 2HNO₃

In product side: 3 N (1 from NO and 6 from nitric acid), 7 O (6 from nitric acid + 1 from NO), 2 H

In reactant side: 3 N, 7 O (6 from the dioxide + 1 from water) and 2 H

7 0
3 years ago
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