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kow [346]
3 years ago
7

True or False: The % abundance of an element's isotopes always totals 100%.

Chemistry
2 answers:
GaryK [48]3 years ago
7 0

Answer:

True

Explanation:

Elena-2011 [213]3 years ago
3 0
Trueeeeeeee .... ...
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Why is plant able to continue to grow and develop once starch supply in the seed is gone?
horsena [70]
<span>They have chloroplasts and use light energy to make more food. I think might be wrong </span>
3 0
4 years ago
What is the Molarity of 0.60 moles of solute in 0.40 L of solution?
AlexFokin [52]

Answer:

1.5M

Explanation:

Molarity = moles/volume

0.60 mol / 0.40 L = 1.5 M

4 0
4 years ago
A gas is placed in a storage tank at a pressure of 30.0 atm at 20.3 C. As a safety device, a small metal plug in the tank is mad
QveST [7]

Answer: 41.2 atm

Explanation

To calculate the final pressure of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

\frac{P_1}{T_1}=\frac{P_2}{T_2}

where,

P_1\text{ and }T_1 are the initial pressure and temperature of the gas.

P_2\text{ and }T_2 are the final pressure and temperature of the gas.

We are given:

P_1=30.0atm\\T_1=20.3^0C=(20.3+273)=293.3K\\P_2=?\\T_2=130^0C=(130+273)K=403K

Putting values in above equation, we get:

\frac{30.0}{293.3K}=\frac{P_2}{403}\\\\P_2=41.2atm

The maximum pressure (in atm) that will be attained in the tank before the plug melts and releases gas is 41.2

8 0
3 years ago
Use the pictures sent<br> Please help
Digiron [165]

Answer:

C(i) the elements are lead (Pb), nitrogen (N) oxygen (O). Lead is found as the Pb 2+ ion and nitrogen and oxygen form the nitrate ion NO 3 –. Its chemical formula is Pb (NO 3) 2.

C(ii) is +2 because the oxidation state of lead is +2. More Lead (II) trioxonitrate(v) is composed of lead ion and the nitrate ion.

I hope this helped

6 0
2 years ago
A compound has a mass percentage of 53.46% C, 6.98% H, and 39.56% O. What is the empirical formula for this compound
Lubov Fominskaja [6]

Answer:

The empirical formula is: C₂H₃O

Explanation:

The empirical formula, also known as the “minimum formula”, is the simplest expression to represent a chemical compound and indicates the elements that are present and the minimum integer ratio between its atoms.

The percentage composition is the percentage by mass of each of the elements present in a compound.

Having 100 g of the compound as a base, it is possible to express the percentages in grams. That is, assuming you have 100 g of the compound, you have 53.46 g of  C , 6.98 g of  H , and 39.56 g of  O.

Taking into account the molecular mass of each substance, the number of relative atoms of each chemical element is calculated:

C: 53.46 g *\frac{1 mol}{12.01 g } = 4.45 moles

H:6.98 g *\frac{1 mol}{1.01 g } = 6.91 moles

O:39.56 g *\frac{1 mol}{16g } = 2.47 moles

Now you divide each value obtained by the least of them:

C: \frac{4.45 moles}{2.47 moles}=  1.80

H:\frac{6.91 moles}{2.47 moles}= 2.8

O:\frac{2.47 moles}{2.47 moles}=1

Decimals approach the nearest integer, then:

C: 2

H: 3

O: 1

Therefore <u><em>the empirical formula is: C₂H₃O</em></u>

5 1
3 years ago
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