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Reptile [31]
3 years ago
5

Can someone please help me

Chemistry
2 answers:
Bumek [7]3 years ago
5 0
The answer is A. I think
AVprozaik [17]3 years ago
5 0
The awnser is 4. Structure D.Hope it helped!
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A 230 g sample of a compound contains 136.6 g of carbon, 26.4 g of hydrogen, and 31.8 g of nitrogen. The rest is oxygen. What is
photoshop1234 [79]
If the total amount of the sample is 230g and they give each component of the sample, we add the given amount of grams of each element and subtract the given from 230g.

136.6+26.4+31.8 = 194.8
230-194.8=35.2

That means the rest of oxygen is 35.2g

This is Percent Composition.

The formula to find the percent composition of an element inside a compound is \frac {MolarMass Of Element}{MolarMass Of Compound}*100

Now we implement the variables into the formula to find the percent composition oxygen.

\frac {35.2}{230} *100 =15.30

The answer is <span>15.30% = O</span>
7 0
3 years ago
g Which ONE of the following ionic compounds is insoluble in water? A) MgCO3 B) Li2CO3 C) NH4Br D) K3PO4 E) Pb(NO3)2
navik [9.2K]

Answer:

A) MgCO₃ is insoluble

Explanation:

Based on the rules of solubility:

All nitrates are soluble. That means Pb(NO₃)₂ is soluble.

All ammonium ions are soluble. NH₄Br is soluble.

All phosphate are insoluble except when combined with group I ions (Li, Na, K...) K₃PO₄ is soluble.

Also, all carbonates are insoluble except when combined with group I ions. That means Li₂CO₃ is soluble and:

<h3>A) MgCO₃ is insoluble</h3>
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4 years ago
What is the average kinetic energy of 1 mole of a gas at 125 kelvin? (R = 8.314 J/K-mol)
Nookie1986 [14]
The average kinetic energy of a mole of gas can be determined through the equation KE= 1.5 nRT where R is the gas constant equal to <span>8.314 J/K-mol and T is temperature, The temperature for this problem is 125 Kelvin and n is equal to 1 mole. KE then is equal to 1558.88 Joules.</span>
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4 years ago
I learned that ____is a substances used to dissolve a ______. Its is of the _____amount. There are substances that can be dissol
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Answer:

1 solute

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Yan po pa braininess nalang po

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3 years ago
PLEASE ANSWER PLEASE
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Sold, liquid, and gasses. Please mark me as the brainlest
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