1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tju [1.3M]
3 years ago
12

Read the given equation.

Chemistry
2 answers:
valentinak56 [21]3 years ago
6 0

Answer: b. 12.9 grams

Explanation:

2Na+2H_2O\rightarrow 2NaOH+H_2

According to avogadro's law, 1 mole of every gas occupies 22.4 Liters at STP ,contains avogadro's number 6.023\times 10^{23} of particles and weighs equal to the molecular mass.

Thus at STP :

1 mole of hydrogen is produced by 2 moles of sodium metal

i.e. 22.4 L of H_2 is produced by 46 gram of sodium metal

6.3 L of H_2 is produced by=\frac{46}{22.4}\times 6.3=12.9gram of sodium metal

ipn [44]3 years ago
5 0
A that would be the correct answer
You might be interested in
NEED HELP ON 17,18,19,20,21,22,23. ONLY IF YOU ARE POSITIVE ABOUT THE ANSWER!!!!
Alex777 [14]

Answer:

17. D. Chemical change

18. C. Cell wall

19. D. To transfer matter and energy within and between organisms.

20. A. Transporting materials

21. C. Carbon dioxide

22. A. Cellular respiration

23. C. Produce food and give off oxygen

Explanation:

I have been able to supply the correct answers. The cell wall functions as a structure that provides structural support and protection to the cell. It is tough, flexible and at times rigid. In a chemical change, new materials with new properties are manufactured. So, the process of photosynthesis is a chemical change.

The endoplasmic reticulum actually transports material. It transports materials like protein and lipids made within the cell and sends it to where they are needed.

Carbon dioxide  is the the gas that animals give off and plants use it during photosynthesis. Cellular respiration involves the activities that result to the breaking down of food in order to release energy.

8 0
3 years ago
PLS HELP: CHEMISTRY
user100 [1]

Answer:

3.59x10^21 molecules

Explanation:

1mole of a substance contains 6.02x10^23 molecules.

Therefore, 1mole of C8H18 will also contain 6.02x10^23 molecules

1mole of C8H18 = (12x8) +(18x1) = 96 + 18 = 114g.

1mole (i.e 114g) oh C8H18 contains 6.02x10^23 molecules.

Therefore, 0.68g of C8H18 will contain = (0.68 x 6.02x10^23)/114 = 3.59x10^21 molecules

7 0
3 years ago
What is the pH of a solution made by mixing 30.00 mL 0.10 M HCl with 40.00 mL of 0.10 M KOH? Assume that the volumes of the solu
nirvana33 [79]

Answer:

pH = 12.15

Explanation:

To determine the pH of the HCl and KOH mixture, we need to know that the reaction is  a neutralization type.

HCl  +  KOH  →  H₂O  +  KCl

We need to determine the moles of each compound

M = mmol / V (mL) → 30 mL . 0.10 M = 3 mmoles of HCl

M = mmol / V (mL) → 40 mL . 0.10 M = 4 mmoles of KOH

The base is in excess, so the HCl will completely react and we would produce the same mmoles of KCl

HCl  +  KOH  →  H₂O  +  KCl

3 m       4 m                       -

             1 m                      3 m

As the KCl is a neutral salt, it does not have any effect on the pH, so the pH will be affected, by the strong base.

1 mmol of KOH has 1 mmol of OH⁻, so the [OH⁻] will be 1 mmol / Tot volume

[OH⁻] 1 mmol / 70 mL = 0.014285 M

- log [OH⁻] = 1.85 → pH = 14 - pOH → 14 - 1.85 = 12.15

3 0
3 years ago
Which is false HCI + CaCO3
tekilochka [14]

Answer:

CaCO3 is false

Explanation:

Because HCl is hydrongen chloride

7 0
3 years ago
A resistor is placed in a circuit. The voltage of the circuit is changed and the current is measured. The graph seen here shows
Arturiano [62]
Answer- 2 Ohms

explain- i took the test!
6 0
2 years ago
Other questions:
  • how many moles of zinc cholride are produced from the reaction of three moles of xinc and an excess of hydrocholric acid
    7·1 answer
  • How did atomic theory develop and change?
    6·1 answer
  • What is the pOH of a solution that has a OH - concentration equal to 1.3x 10^-10
    8·2 answers
  • Why do atoms share electrons in covalent bonds??
    8·2 answers
  • Using the diagram below, which rock layer is older than the Chinle Formation?
    12·1 answer
  • I am giving Brainlest plus points to whoever answers right!!!!!
    5·1 answer
  • Mixture of acid and base
    11·1 answer
  • What are the extremely small particles that all elements are composed of?
    10·2 answers
  • What is the Lewis dot diagram of ca and br?
    8·1 answer
  • 2)A relatively unreactive metal that is yellow colored.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!