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Law Incorporation [45]
3 years ago
6

Please answer this question

Chemistry
1 answer:
ZanzabumX [31]3 years ago
6 0

Answer:

Is the fixed number of water molecules present in one formula unit of a substance

Explanation:

When copper sulphate is heated in a china dish, the blue colomed crystal changes to a white powder due to the removal of molecules of water of crystallization

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What is the mass of CO2 lost at 20 min from the limestone sample?
harkovskaia [24]

Answer:

The mass, CO2 and CO3 from the limestone sample is discussed below in details.

Explanation:

(A) mass loss of sample of limestone after 20 min

= 0.8437g-0.5979g = 0.2458 g

From the given reaction of limestone, 2 mol of the sample gives 2 moles of CO 2.

Therefore  

184.4 g ( molar mass of limestone) gives2× 44 g of carbon dioxide.

1 g of sample gives 88/184.4 g of carbon dioxide

Hence 0.2458 g sample gives

= 88/184.4 × 0.2458 g = 0.117 g carbon dioxide

(B) mole of CO 2 lost = weight/ molar mass

= 0.117 g / 44 g/mol =0.0027 mole

(C). 1 mol of limestone contain 2 mol of carbonate ion

From the reaction we know that carbonate ion of limestone is converted into carbondioxide

Hence lost carbonate ion = 0.2458 g

(D) we know that

1 mol limestone contain 1mol CaCO​​​ 3

Hence in sample present CaCO​​​ 3

= 1mole / 184.4 g × 0.8437 g= 0.00458 mol CaCO​​​3

8 0
3 years ago
Please answer
yKpoI14uk [10]
Long wave I think is the correct answer
7 0
3 years ago
An object that is traveling around another body in space is in ______ around that body
anastassius [24]
An object that is traveling around another body in space is in ORBIT around that body
6 0
3 years ago
how often should gas appliances be checked for proper operation in order to prevent carbon monoxide poisoning?
yawa3891 [41]
You should be checking your gas appliances every year, it should always be a qualified technician.
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3 years ago
Compared to most substances, water is unusual because it ____ when it goes from the liquid to solid state.
yuradex [85]

Answer:

expands

Explanation:

Most substances become increasingly compressed when frozen solid, but water is a famous exception.

6 0
3 years ago
Read 2 more answers
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