# Small moles questionWatch

Announcements
#1
Which mass of solid residue can be obtained from the thermal decomposition of 4.10 g ofanhydrous calcium nitrate?
A 0.70 g
B 1.00 g
C 1.40 g
D 2.25 g
0
3 years ago
#2
Write the balanced equation. This tells you the ratios of reagents to products.
Find the 'actual' number of moles of reagents used.
Using the ratio established in the equation, find the number of moles of 'useful' product
Find Formula mass for the product and multiply by the number of moles present to get an answer.
0
3 years ago
#3
Write out a balanced symbol equation first, using state symbols. (It is the Thermal Decomposition of a Group 2 Nitrate)
Identify the solid in the products.

Then, calculate the formula mass of the anhydrous Calcium Nitrate, and the solid residue.

From here, it is simply a ratio.

You should get an answer that is less than half of 4.1g, (very rough estimate).
0
#4
(Original post by an_atheist)
Write the balanced equation. This tells you the ratios of reagents to products.
Find the 'actual' number of moles of reagents used.
Using the ratio established in the equation, find the number of moles of 'useful' product
Find Formula mass for the product and multiply by the number of moles present to get an answer.
Thanks, cheers!
0
#5
(Original post by Ishan_2000)
Write out a balanced symbol equation first, using state symbols. (It is the Thermal Decomposition of a Group 2 Nitrate)
Identify the solid in the products.

Then, calculate the formula mass of the anhydrous Calcium Nitrate, and the solid residue.

From here, it is simply a ratio.

You should get an answer that is less than half of 4.1g, (very rough estimate).
Thank you, have a good day!
0
X

new posts Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• University of Hull
Sat, 23 Nov '19
• Edge Hill University
Sat, 23 Nov '19
• Keele University
Sat, 23 Nov '19

### Poll

Join the discussion

#### What offers have you received from universities?

Unconditional (54)
19.71%
Unconditional if firmed (22)
8.03%
Unconditional if insurance (2)
0.73%
Both unconditional and unconditional if firm/insurance (9)
3.28%
No unconditional offers (187)
68.25%