# science

Posted by Josh on Saturday, March 17, 2007 at 10:58pm.

How many grams of hydrochloric acid are required to react completely with 4.30g of zinc?

How many molecules of gas will be produced?

science - DrBob222, Saturday, March 17, 2007 at 11:07pm
1. Write the balanced chemical equation.
Zn + 2HCl ==> ZnCl2 + H2

2. Convert grams Zn to mols.
mols = grams/atomic mass Zn.

3. Using the balanced equation, convert mols Zn to mols HCl.

4. Now convert mols HCl to grams HCl.
grams HCl = mols HCl x molar mass HCl.

Post your work if you get stuck.

science - Josh, Saturday, March 17, 2007 at 11:19pm
Zn=1 Zn=1
H=2 H=2
Cl=2 Cl=2

mols= 4.30/65.4
=.065749235

I don't know what to do next

science - Josh, Saturday, March 17, 2007 at 11:25pm
mol of HCl=73?

science - DrBob222, Sunday, March 18, 2007 at 12:55am
1. Write the balanced chemical equation.
Zn + 2HCl ==> ZnCl2 + H2

2. Convert grams Zn to mols.
mols = grams/atomic mass Zn.
You have 4.30/65.4 = 0.0658 mols Zn which is correct.

3. Using the balanced equation, convert mols Zn to mols HCl.
Use the coefficients in the balanced equation to convert mols Zn to mols HCl.
mols HCl = 0.0658 mols Zn x (2 mols HCl/1 mol Zn) =?? mols HCl

4. Now convert mols HCl to grams HCl.
grams HCl = mols HCl x molar mass HCl.

??mols HCl from step 3 x molar mass HCl = xx

post your work if you have trouble.

science - Jennifer, Sunday, March 18, 2007 at 1:08am
4.74

science - Josh, Sunday, March 18, 2007 at 2:00am
what is the answer for questions a and b? or have we gotten there yet?

This is crazy reposting all the work, which is repetitive.

You write the balanced equation, which you have. You determine the moles of zinc, which you have. You determine the moles of HCl it takes to react with the moles of zinc (look at the balanced equation for the ratio). Finally, convert those moles of HCL to grams of HCl.
For the molecules of gas, use the balanced equation to give you the ratio of moles H2 per mole of zinc. Then, from the ratio, and the moles of zinc, you can calculate the moles of H2. Molecules? moles of H2 times avagradros number.

see...http://members.aol.com/rtccpu/DOCs/stoich/DoubleYDiagram.PDF

1.204?

1. 👍 0
2. 👎 0
3. 👁 138

## Similar Questions

1. ### chemistry

Posted by Bret on Friday, March 16, 2007 at 10:44am. what is the oxidation number for nitrogen in the following? NH3 NO2 1- N2 NO2Cl N2H4 For Further Reading chemistry - bobpursley, Friday, March 16, 2007 at 11:26am We will be

asked by Bret on March 16, 2007
2. ### Math

I need help for this question. I also need an explanation.The answer says log3(3x^2) but I need an explanation. 1 + log3(x^2) Math - Steve, Saturday, June 27, 2015 at 6:51pm I'm not Carnak the Magnificent. What was the question,

asked by Anonymous on June 27, 2015
3. ### Calc pt2

Original question: Posted by Lost One on Tuesday, March 5, 2013 at 12:04pm. Let f(x) = (2/3)x^3 - 2x + 1 with a restricted domain of [1,infinity]. What is the value of (f-1)'(x) when x = 13? •Calc - Steve, Tuesday, March 5, 2013

asked by Lost One on March 5, 2013

What is the pH of a 5.06E-2 M aqueous solution of sodium acetate? I know that I would set this up the same way I did for the previous question that I posted. I am just confused on how to find the Ka. I know it is kw/kb but for

asked by Hannah on April 8, 2012
5. ### chemistry

Suppose that 50.0 cm3 of 2.00 M hydrochloric acid are added to 4.00 grams of zinc metal. What it the limiting reagent? How many grams of zinc are actually consumed? What is the concentration of the hydrochloric acid solution after

asked by Fania on November 8, 2010
6. ### Chemistry

16.7 grams of chlorine gas are allowed to react with with 3.31 grams of water What is the maximum amount of hydrochloric acid that can be formed in grams. What is the maximum amount of hydrochloric acid that can be formed? grams

asked by Austin Jekins on December 4, 2010
7. ### Chemistry

I'm not sure how to do these...I keep getting the wrong answers... Please help someone... Mg(s) + 2 HCl(aq)= MgCl2 (aq) + H2(g) a. What volume of 15.7 M hydrochloric acid will react with 2.1 grams of Mg? b. What mass of magnesium

asked by Ava on April 15, 2016
8. ### math help

Posted by grant on Saturday, May 12, 2007 at 9:20am. The table shows the depth (d metres) of water in a harbour at certain times (t hours) after midnight on a particular day. time t (hours) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 and the

asked by grant on May 12, 2007
9. ### stomach

Under certain abnormal conditions, the stomach does not secrete hydrochloric acid. Identify three functions that hydrochloric acid has in the digestive process and describe how the failure to secrete hydrochloric acid will affect

asked by hen on August 8, 2006
10. ### Math repost for jet

Posted by Jet on Saturday, September 29, 2007 at 2:01pm. The least number of moves in the Tower of Hanoi puzzle with 5 disks?

asked by Writeacher on September 29, 2007

More Similar Questions