chem

I can't seem to figure this out!
I know I have to use mass to mass conversions though.

Can someone help me out?

Hydrochloric acid can dissolve solid iron according to the following equation: Fe + 2HCl to form FeCl2 + H2

a) How much HCl in grams would you need to dissolve a 2.8-g iron bar on a padlock?

b) How much H2 would be produced by the complete reaction of the iron bar?

Step 1. Write the balanced equation. You have that.
Fe + 2HCl ==> FeCl2 + H2

Step 2. Convert what you have from grams to mols.
mols = g/molar mass
mols Fe = 2.8 g/56 = o.05 mols

Step 3. Using the coefficients in the balanced equation, convert mols of what you have (in this case mols Fe) to mols of what you want (in this case mols HCl).

0.05 mols Fe x (2 mols HCl/1 mol Fe) = 0.05 x 2 = 0.10 mols HCl.

Step 4. Convert mols of HCl to grams.
grams HCl = mols HCl x molar mass HCl.

Post your work if you get stuck. You can follow this same procedure to work part b and any other stoichiometry problem you may have. ALSO, note that I rounded and used 56 for the atomic mass of Fe. You will need to go back through it and use a more exact number. Good luck.


0.05 mol Fe *2 mol HCl/ 1 mol Fe= .10 mol HCl

0.10 mol HCl *36.46g HCl/2mol HCl = 1.82 g HCl

correct?

  1. 👍
  2. 👎
  3. 👁

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    In the Figure the pulley has negligible mass, and both it and the inclined plane are frictionless. Block A has a mass of 1.3 kg, block B has a mass of 2.7 kg, and angle è is 26 °. If the blocks are released from rest with the

  2. Physics

    A 9.00 kg mass is connected by a light cord to a 1.00 kg mass on a smooth surface as shown in the figure. The pulley rotates about a frictionless axle and has a moment of inertia of 0.300 k∙m2 and a radius of 0.500 m. Assuming

  3. Physics

    The figure below shows a box of dirty money (mass m1 = 4.0 kg) on a frictionless plane inclined at angle θ1 = 35°. The box is connected via a cord of negligible mass to a box of laundered money (mass m2 = 2.0 kg) on a

  4. physics

    The coefficient of friction between the block of mass m1 = 3.00 kg and the surface in the figure below is ìk = 0.365. The system starts from rest. What is the speed of the ball of mass m2 = 5.00 kg when it has fallen a distance h

  1. physics

    The linear momentum of a body can be calculated by multiplying its mass by the Question 1 options: time during which the mass moves. distance the mass moves. acceleration of the mass. velocity of the mass. Save

  2. physics

    You know that you can safely stand on the hang-over end of a heavy plank that rests on a table. How far depends on your mass and the mass of the plank. Suppose you can stand on the end of a plank that overhangs the edge of the

  3. Math

    Paulina works out with a 2.5 kilogram mass. What is the mass of the 2.5 kilogram mass in grams? Please help to be able to figure out the answer.

  4. Physics

    At some point during their orbit, the location of the Earth and Moon relative to the Sun will be as shown in the figure below. What are the magnitude, in N, and direction of the force experienced by the Moon, in degrees below the

  1. physics

    Suppose the hand shown in (Figure 1) holds an 8.9-kg mass. The total mass of the arm is 3.3 kg. What force, FM, is required of the deltoid muscle, assuming the mass is 52 cm from the shoulder joint? So ive tried this problem

  2. Physics

    A hoop of mass M = 3 kg and radius R = 0.5 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to

  3. College physics - Center of mass

    College Physics- Center of Mass? The objects in the figure below are constructed of uniform wire bent into the shapes shown (Figure 1) . Each peice has a length of 0.15 . There are two objects that we need to figure out the x- and

  4. physics

    The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.00 kg (N.B. as you know, the scale should read N, but no one told the manufacturer). The distances in the figure (which is not to scale) are: D1

You can view more similar questions or ask a new question.