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4 years ago

When a solid changes to gas, what is it called??

Chemistry

1 answer:

Kay [80]4 years ago

8 0

When solid changes it's phase to gas without forming liquid, process is called sublimation.

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A fertilizer is 60.9% ammonium phosphate. What is the percent P in the sample? Answer in units of %

PtichkaEL [24]

Answer:- 12.7%

Solution:- It says, ammonium phosphate is 60.9%. It means if we assume 100 g of the sample then there is 60.9 g ammonium phosphate in it.

Formula of ammonium phosphate is $(NH_4)_3PO4$ and it's molecular weight is 149 grams per mol. There is only one P in the formula and so the mass of P in 149 g of ammonium phosphate is 31 g(atomic mass of P).

Now, we could use the proportions to find out the mass percentage of P in the sample.

31 g P is present in 149 g of ammonium phosphate, how many grams of P would be present in 60.9 g of ammonium phosphate. Let's set the proportions as:

$\frac{31}{149}=\frac{x}{60.9}$

$x=\frac{31(60.9)}{149}$

$x=12.7$

This 12.7 g of phosphorous is present in 100 g of the sample means there is 12.7% phosphorous in the sample.

3 0

3 years ago

Analysis of a sample of a compound, containing only carbon, nitrogen, hydrogen, and oxygen, determined that it contained 20.0% C

choli [55]

Answer:

CH₄N₂O

Explanation:

Let's assume 100 g of the compound, thus, the mass of each substance is it percent multiplied by 100:

C = 20.0 g (20% = 0.20, and 0.20*100 = 20.0)

H = 6.7 g

N = 46.6 g

O = 100 - (20+6.7+46.6) = 26.7 g

The number of moles of each compound is the mass divided by the molar mass. The molar masses are C = 12.011 g/mol, H = 1.00794 g/mol, N = 14.01 g/mol, and O = 15.999 g/mol, so:

nC = 20/12.011 = 1.67 mol

nH = 6.7/1.00794 = 6.65 mol

nN = 46.6/14.01 = 3.33 mol

nO = 26.7/15.999 = 1.67 mol

The empirical formula is the formula with the minimum possible number of the moles of each compound, which must be proportional to the percent of each one. So, we must divide each number of moles for the smallest, 1.67:

C = 1.67/1.67 = 1

H = 6.65/1.67 = 4

N = 3.33/1.67 = 2

O = 1.67/1.67 = 1

So, the empirical formula is CH₄N₂O.

6 0

4 years ago

What will you suggest to a person who is suffering from the problem of acidity after overeating?

Bumek [7]

Answer:

If someone is suffering from the problem of acidity after overeating Baking soda solution would be suggested as a remedy as it is basic in nature, it neutralises excess acid in the stomach.

3 0

3 years ago

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A city water district wants to encourage local businesses and homeowners to landscape with drought-tolerant plants. After disapp

tino4ka555 [31]

Answer:

the complete question is found in the attachment

Explanation:

the complete explanation is found in the attachment