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
Vitek1552 [10]
2 years ago
12

Please answer this question correctly i really need it. Be serious.

Chemistry
2 answers:
lina2011 [118]2 years ago
7 0

Answer:

The first one

Explanation:

kenny6666 [7]2 years ago
6 0

Answer:

I think A but to be fair if you get it wrong I am a 6th grader

Explanation:

You might be interested in
What Element is found in column 16, period 2?
Art [367]
The answer is Sulfur.

8 0
3 years ago
Read 2 more answers
The average atomic mass of Eu is 151.96 amu. There are only two naturally occurring isotopes of europium, Eu with a mass of 151.
earnstyle [38]

Answer:

The percentage abundance of Eu isotopes are 52 %  and 48 % .

Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope,:

% = x %

Mass = 151.0 amu

For second isotope :

% = 100  - x  

Mass = 153.0 amu

Given, Average Mass = 151.96 amu

Thus,

151.96=\frac{x}{100}\times {151.0}+\frac{100-x}{100}\times {153.0}

Solving for x, we get that:

x = 52 %

<u>Thus percentage abundance of Eu isotopes are 52 %  and 48 % .</u>

7 0
3 years ago
How much water, in grams, can be made from 1.03 x <img src="https://tex.z-dn.net/?f=10%5E%7B24%7D" id="TexFormula1" title="10^{2
krok68 [10]

Answer:

30.8 g of water are produced

Explanation:

First of all we need the equation for the production of water:

2H₂ + O₂ → 2H₂O

2 moles of hydrogen react with 1 mol of oxygen in order to produce 2 moles of water.

As we assume, the oxygen in excess, we determine the moles of H₂.

1.03ₓ10²⁴ molecules . 1 mol/ 6.02ₓ10²³ molecules = 1.71 moles

Ratio is 2:2, so 1.71 moles will produce 1.71 moles of water

Let's convert the moles to mass: 1.71 mol . 18g / 1mol = 30.8 g of water are produced

5 0
3 years ago
Oxygen freezes at -219°c and boils at -183°c in which state is oxygen at -200°c​
vova2212 [387]

oxygen is in gaseous state at this temperature

4 0
2 years ago
SOME ONE HELP ME ON THIS WEBSITE
Sergio039 [100]
Every cell has a nucleus unless it is RNA which is involved with DNA movement
4 0
3 years ago
Other questions:
  • Give two reasons why quarrying is bad for the environment?
    7·1 answer
  • Imagine you are a civil engineer who designs buildings. How might testing small-scale building models or their components be hel
    9·2 answers
  • Sadie knows that the school record for the 100-meter dash is 18 seconds. During last weekend's race, the track coach time
    14·2 answers
  • Can ya help me,relate how does population size relate to resource availability in an enviroment?
    9·1 answer
  • Ill give brainlist pls help me and don't guess I want full explanation please.
    5·1 answer
  • 9. Calculate the frequency of light with a wavelength = 12 km. (kilo = 10')
    11·1 answer
  • Which of these describes a chemical property of a substance?
    7·2 answers
  • The earth's crust is part of which sphere?​
    7·1 answer
  • Which is that law?????????
    14·1 answer
  • Wine goes bad soon after opening because the ethanol (CH3CH2OH) dissolved in it reacts with oxygen (O2) gas to form water and aq
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!