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
scoundrel [369]
3 years ago
9

What mass of hbr (in g) would you need to dissolve a 3.4 −g pure iron bar on a padlock?

Chemistry
1 answer:
vivado [14]3 years ago
5 0

<u>Given:</u>

Mass of pure iron (Fe) = 3.4 g

<u>To determine:</u>

Mass of HBr needed to dissolve the above iron

<u>Explanation:</u>

Reaction between HBr and Fe is

Fe + 2HBr → FeBr₂ + H₂

Based on the reaction stoichiometry-

1 mole of Fe reacts with 2 moles of HBr

# moles of Fe = mass of Fe/atomic mass of Fe = 3.4/56 g.mol⁻¹ = 0.0607 moles

Therefore # moles of HBr = 2*0.0607 = 0.1214 moles

Molar mass of HBr = 81 g/mole

Mass of HBr = 0.1214 moles * 81 g/mole = 9.83 g

Ans: Mass of HBR required is 9.83 g

You might be interested in
Which of the following statements correctly describes the relationship between volume and temperature( moles and pressure of gas
lorasvet [3.4K]

Answer:

pressure of gas are constant describe the relationship between moles and temprature

6 0
3 years ago
When studying atoms, scientists can ignore the
vekshin1

When studying atoms, scientists can ignore <u>the Gravitational</u> force between charged particles that make up  the atoms because it is many millions of times smaller than other forces in the atom.

Explanation:

Scientists can ignore the gravitational force because the gravitational force is considered to be negligible as compared to the other forces due to its smaller value.We all know that the gravitational force is directly proportional to the mass of an object which  result in  a small force value.When the value of this small force is compared to the value of the electrical force between protons and electrons in atoms the we can say that the electrical force is million times stronger than the gravitational force

Thus we can say that scientists can ignore <u>the Gravitational</u> force between charged particles that make up  the atoms because it is many millions of times smaller than other forces in the atom.

3 0
2 years ago
Which of the following compounds has an atom with an unfilled valence shell of electrons? And why?A. H3O+B. BF3C. CH3OHD. NaI
adoni [48]

Answer: BF3

Explanation: boron needs 4 electron to obtain octet and Fluorine has just one. For the valence shell to be completely filled it will have to form BF4- with 4 fluorine atom surrounding it.

8 0
3 years ago
Which of the following describes what occurs as a gas becomes a liquid?
lora16 [44]
As the gas cools it condenses and becomes a liquid its atoms also become smaller
5 0
3 years ago
What is an energy transformation?
Dafna11 [192]
Energy is invisible yet it's all around us and throughout the universe. Energy can never be made or destroyed, but its form can be converted and changed.
While energy can be transferred or transformed, the total amount of energy does not change – this is called energy conservation.
Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. In physics, energy is a quantity that provides the capacity to perform work or provides heat.
When energy is transformed from one form to another, or moved from one place to another, or from one system to another there is energy loss. This means that when energy is converted to a different form, some of the input energy is turned into a highly disordered form of energy, like heat. This consent is known as “hidden energy”.
4 0
3 years ago
Other questions:
  • 11. Calculate the amount of heat transferred when 550 grams of water cools from an initial temperature of
    14·1 answer
  • A sample of pure NO2 is heated to 338 ∘C at which temperature it partially dissociates according to the equation 2NO2(g)⇌2NO(g)+
    12·1 answer
  • Given: logK=nE∘0.0592 What is the value K for this redox reaction? Zn2+(aq) + 2 Cl−(aq) → Zn(s) + Cl2(
    15·1 answer
  • If 3 g of element C combine with 8 g of element D to form compound CD, how many grams of D are needed to form compound CD2?
    7·1 answer
  • The energy absorbed or released when an electron is added to a gaseous atom is know as
    10·2 answers
  • Which of the following is true about two neutral atoms of the element gold?
    6·2 answers
  • A gas mixture with 4 mol of Ar, x moles of Ne, and y moles
    8·1 answer
  • When thermal energy is removed from matter, what happens to the molecules?​
    9·1 answer
  • Can someone plzzz helppp meeee!!!!!!
    15·1 answer
  • How does the immune system uses feedback mechanisms?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!