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ludmilkaskok [199]
3 years ago
13

If the heat of combustion of hydrogen is -285.8KJ,what is the heat of formation of water​

Chemistry
1 answer:
ExtremeBDS [4]3 years ago
5 0

Answer:

The heat of formation of H2O(g) is likely to be-242,8KJ.

Explanation:

The heat of formation of H2O(g) will be slightly lower than the heat of formation of H2O(1)as some energy is released during condensation of water vapour to liquid water.

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HELP!! pick the correct answer please. picture attached
Mamont248 [21]

Answer:

A solution, in science, refers to a type of mixture involving two or more substances. Specifically, the solution definition refers to a type of homogeneous mixture - i.e., a mixture that has a uniform composition and its individual components cannot be distinguished

5 0
3 years ago
Read 2 more answers
“Na2SO3” represents sodium sulfite.What does the 4 mean in the formula 4Na2SO3?
Strike441 [17]

The mass of substance which consists the equal number of particles as 12 grams of Carbon-12 is said to be mole.

For example:

The balanced chemical equation for production of water from hydrogen and oxygen is:

2H_2(g) + O_2(g) \rightarrow 2H_2O(l)

That means 2 moles of H_2 reacts with 1 mole of O_2 to give 2 moles of  H_2O.

The given formula is 4Na_2SO_3.

Hence, 4 represents the number of moles in 4Na_2SO_3 formula that is 4 moles of Na_2SO_3.

The number of atoms of sodium, Na in 4Na_2SO_3 is:

4 \times 2 = 8

The number of atoms of sulfur, S in 4Na_2SO_3 is:

4 \times 1 = 4

The number of atoms of oxygen in, O in 4Na_2SO_3 is:

4 \times 3 = 12

6 0
3 years ago
Read 2 more answers
Balance this equation. if a coefficient of "1" is required, choose "blank" for that box.
blondinia [14]
Step 1: Write Imbalance Equation

                            CH₃CHO  +  O₂    →    CO₂  +  H₂O

Step 2: Balance Carbon Atoms:
                                                 There are 2 carbon atoms at reactant side and one at product side. So multiply CO₂ with 2 to balance them. i.e.

                             CH₃CHO  +  O₂    →    2 CO₂  +  H₂O 

Step 3: Balance Hydrogen Atoms:
                                                      There are 4 hydrogen atoms at reactant side and 2 Hydrogen atoms at product side. So, multiply H₂O by 2 to balance Hydrogen on both sides. i.e.

                    CH₃CHO  +  O₂    →    2 CO₂  +  2 H₂O

Step 4: Balance Oxygen Atoms:
                                                   There are 3 Oxygen atoms at reactant side and 6 Oxygen atoms at product side. In order to balance them multiply O₂ on reactant side by 2.5 (5/2). i.e  

                    CH₃CHO  +  5/2 O₂    →    2 CO₂  +  2 H₂O

Step 6: Eliminate Fraction:
                                         Multiply overall equation by 2 to eliminate fraction. i.e. 

                    2 CH₃CHO  +  5 O₂    →    4 CO₂  +  4 H₂O
7 0
3 years ago
The ability for carbon to form long chain or rings is<br>​
kirill [66]
Califactual. thsi is correct bcuz carbon takes 20 minutes to dissolve and ring making it a factual
8 0
3 years ago
What is the density of a 6.0 × 102 mL liquid sample that weighs 450 g?
mart [117]

Answer:

<h2>Density = 0.75 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

Density =  \frac{mass}{volume}

From the question

mass = 450 g

volume = 6.0 × 10² mL

Substitute the values into the above formula and solve for the density

That's

Density =  \frac{450}{6 \times  {10}^{2} }  =  \frac{450}{6 00}  \\  =  \frac{3}{4}

We have the final answer as

<h3>Density = 0.75 g/mL</h3>

Hope this helps you

8 0
3 years ago
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