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timofeeve [1]
3 years ago
9

How many atoms of Fr are there?

Chemistry
2 answers:
kramer3 years ago
7 0
The answer is: 87
i have to type other letters so blah blah blah... i hope this helps you:)
Crazy boy [7]3 years ago
7 0
There are 87 atoms in Fr
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Which describes a precipitate in a chemical reaction?
nekit [7.7K]

Answer:

D

Explanation: A precipitation reaction is a type of chemical reaction in which two soluble salts in aqueous solution combine and one of the products is an insoluble salt called a precipitate.

5 0
3 years ago
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The element lead (pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, n 207.9766
Marina CMI [18]

The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

average atomic mass = \Sigma {percent abundance}\times {atomic mass}

Substituting the values in the formula:

average atomic mass = \frac{{203.97302}\times {1.4}+{205.9744}\times {24.1}+{206.97587}\times {22.1}+{207.97663}\times {52.4}}{100}

average atomic mass = \frac{285.562228+4963.984004+4574.166727+10897.975412}{100}

average atomic mass = \frac{20721.688371}{100} = 207.22 amu

The most common isotope of lead is:

Lead - 207.22 amu

The atomic symbol of lead is Pb. The atomic number of Pb is 82.

So, the the most common isotope of lead can be written as:

_{207.22}^{82}Pb and Lead - 207.22 amu.

3 0
3 years ago
who reported four “element” classifications, but included some substances that were combinations of elements rather than true el
kozerog [31]
Answer: Antoine Lavoisier.

He classified the elements into four groups: elastic fluids, nonmetals, metals and earths. Some of the called elementes were not really elements (light and heat). Others were compounds, e.g. hydrochloric acid.






7 0
3 years ago
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At 517 mm Hg and 24 °C, a sample of gas occuples a volume of 95 ml. The gas is transferred to a 225-ml flask and the temperature
vodomira [7]

Answer:

P_2=194.78mmHg

Explanation:

Hello,

In this case, we employ the combined ideal gas law in order to understand the volume-gas-pressure behavior as shown below:

\frac{P_1V_1}{T_1}= \frac{P_2V_2}{T_2}

Hence, solving for the final pressure P2, we obtain (do not forget temperature must be absolute):

P_2=\frac{P_1V_1T_2}{V_2T_1}=\frac{517mmHg*95mL*(-8.0+273.15)K}{(24+273.15)K*225mL}\\ \\P_2=194.78mmHg

Best regards.

7 0
4 years ago
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A sample of oxygen gas occupies 3.60 liters at a pressure of 1.00 atm. If temperature is held constant, what will be the volume
evablogger [386]
P1V1=P2V2
(1.00atm)(3.60L)=(2.50atm)V
3.60=(2.50atm)V
3.60/2.50=V
1.44L=V
3 0
4 years ago
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