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1 year ago

Hiya if you answr more than 5 = extra points please answer and least 3 lol and maybe explain how i can do it

Chemistry

1 answer:

Harrizon [31]1 year ago

3 0

Answer:

copy and paste them into the search and all of the answers come up trust me

Explanation:

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In the decomposition potassium nitride, 10.65 g of nitrogen form. How much potassium nitride was present initially ?

leonid [27]

Answer:

Mass = 99.8 g

Explanation:

Given data:

Mass of potassium nitride = ?

Mass of nitrogen produced = 10.65 g

Solution:

Chemical equation:

2K₃N→ 6K + N₂

Moles of nitrogen:

Number of moles = mass/ molar mass

Number of moles = 10.65 g / 28 g/mol

Number of moles = 0.38 mol

Now we will compare the moles of nitrogen with potassium nitride.

N₂ ; K₃N

1 : 2

0.38 : 2×0.38 =0.76

Mass of potassium nitride:

Mass = molar mass × number of moles

Mass = 131.3 g/mol × 0.76 mol

Mass = 99.8 g

7 0

3 years ago

Explain why we must balance all chemical equations

enyata [817]

Answer:

The chemical equation needs to be balanced so that it follows the law of conservation of mass.

Explanation:

3 0

3 years ago

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HELP I'LL GIVE YOU 15 POINTS CAUSE THAT'S ALL I'VE GOT, BUT I NEED IT PLEASE!

nekit [7.7K]

All mixtures contain only one kind of atom.

~Mschmindy

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2 years ago

A 3.4 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.9 g. The two substances react, rel

natima [27]

Answer: 2.7 grams

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

$NaHCO_3(aq)+CH_3COOH(aq)\rightarrow CH_3COONa(aq)+H_2O(l)+CO_2(g)$

Given: mass of sodium hydrogen carbonate = 3.4 g

mass of acetic acid = 10.9 g

Mass of reactants = mass of sodium hydrogen carbonate+ mass of acetic acid = 3.4 + 10.9= 14.3 g

Mass of reactants = Mass of products in reaction vessel + mass of carbon dioxide (as it escapes)

Mass of carbon dioxide = 14.3 - 11.6 =2.7 g

Thus the mass of carbon dioxide released during the reaction is 2.7 grams.

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2 years ago

A company sells a natural medicine with plant ingredients to help treat dementia, a disease in which people have a hard time rem

sammy [17]

I think it is the second one. hope it helps! :)

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3 years ago

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