1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ber [7]
3 years ago
8

I find that there are 500 atoms of U-235 and 1500 atoms of Pb-207. If we assume the mineral contained only parent and no daughte

r, then how many atoms of these elements were in the mineral when the rock first formed?
Chemistry
1 answer:
swat323 years ago
3 0

Explanation:

From the question it can be infered that initially only parent atoms were present in the rock and  no daughter atom. So, initially there was only uranium atom and no lead atom. So, in total there were 500+1500= 2000 uranium atom. And no lead tom was there.

You might be interested in
To eight significant figures, avogadro's constant is 6.0221367×1023mol−1. which of the following choices demonstrates correct ro
FrozenT [24]
6.0221367 rounded from the last digit would be 6.022137 but when using it calculations, you should just use 6.022 x 10^23.  
5 0
3 years ago
Read 2 more answers
In which natural cycle must an important gas in Earth's atmosphere be fixed before plants can use it?
Maru [420]
The answer is C . nitrogen cycle
5 0
3 years ago
Read 2 more answers
How many moles are present in 2.7 liters of Argon gas at STP?
Neko [114]

6.9 cause argon is a proactive system that can be sick

4 0
2 years ago
Why is the enzyme pectinase added during the manufacture of fruit juices?
MariettaO [177]
The choices can be found elsewhere and as follows:

<span>A.The enzyme pectinase speeds up the breakdown of pectin in fruits, producing more juice.. .
B.The enzyme pectinase enhances the taste of fruit juices, making them more popular.. .
C.The enzyme pectinase speeds up the breakdown of toxins in fruits, producing more juice.

The correct answer would be A. </span>The enzyme pectinase speeds up the breakdown of pectin in fruits, producing more juice. With this, the manufacturer company will get more volume of product from same amount of resource.
6 0
3 years ago
A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is
Airida [17]

Answer:

the maximum safe operating temperature the engineer should recommend for this reaction is 616 °C  

Explanation:

Given the data in the question;

First we calculate the Volume of the steel cylinder;

V = πr²h

radius r = Diameter / 2 = 27 cm / 2 = 13.5 cm

height h = 32.4 cm

so we substitute

V = π × ( 13.5 cm )² × 32.4 cm

V  = π × 182.25 cm × 32.4 cm

V = 18550.79 cm³  

V = 18.551 L

given that; maximum safe pressure P = 3.10 MPa = 30.5946 atm

vessel contains 0.218kg or 218 gram of carbon monoxide gas

molar mass of carbon monoxide gas is 28.010 g/mol

so

moles of carbon monoxide gas n = 218 gram /  28.010 g/mol = 7.7829 mol

we know that;

PV = nRT

solve for T

T = PV / nR

we know that gas constant R = 0.0820574 L•atm•mol⁻¹ K⁻¹

so we substitute

T = ( 30.5946 × 18.551 ) / ( 7.7829 × 0.082 )

T = 567.5604 / 0.6381978

T = 889.317387 K

T = ( 889.317387 - 273.15 ) °C

T = 616.167 ≈ 616 °C  { 3 significant digits }

Therefore, the maximum safe operating temperature the engineer should recommend for this reaction is 616 °C  

6 0
2 years ago
Other questions:
  • Which statement is true about writing chemical formulas of covalent compounds?
    6·2 answers
  • The equation NaCI + AgF -&gt; NaF + AgCI is an example of what type of reaction
    6·1 answer
  • Which of the following is the best explanation for a covalent bond?
    11·1 answer
  • 2nh3(l) → nh4+(am) + nh2−(am) where (am) represents solvation by ammonia. at the boiling point (−33°c), kam = 5.1 × 10−27. calcu
    14·1 answer
  • What is an example of a compound science
    5·1 answer
  • A as dhitssfghj plz help help
    6·1 answer
  • I have similar chemical and physical properties to calcium but my molecular mass is lower, what element am I?
    11·1 answer
  • In the following list, only is not an example of a chemical reaction
    9·1 answer
  • Industries use heterogeneous catalysts because they are _______
    5·1 answer
  • In the laboratory you dissolve 12.2 g of iron(II) iodide in a volumetric flask and add water to a total volume of 500 mL.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!