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sleet_krkn [62]
3 years ago
12

Carbon-14 has a half-life of 5,730 years. It is used in "carbon dating" to determine the age of once living organisms. How much

of a 144 gram sample of C-14 will remain after 17,190 years have past.
Chemistry
1 answer:
Nookie1986 [14]3 years ago
7 0

Answer:

18 grams

Explanation:

Because 17,190 yrs divided by the amount of years it takes for a half-life to occur is 3. So 3 half life’s happen, so you divide 144/2 once, equaling 72. You divide 72/2 again (another half-life) and you get 36. You then calculate the third half life by dividing 36/2 which equals 18 grams.

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2.50 L of a gas at standard temperature and pressure is compressed to 575 mL. What is the new pressure of the gas
vfiekz [6]

Answer:

4.35 atm

Explanation:

According to the information given;

  • Initial volume of the gas, V₁ is 2.50 L
  • Initial pressure of the gas is standard pressure P₁, normally 1 atm
  • New volume of the gas, V₂ is 575 mL

We are required to determine the new pressure of the gas, P₂ ;

To answer the question, we are going to use the Boyle's law, that relates pressure and volume at constant temperature.

According to Boyle's law;

P₁V₁ = P₂V₂

Therefore, to determine the new pressure, P₂, we rearrange the formula;

New pressure, P₂ = P₁V₁ ÷ V₂

Thus;

P₂ = ( 1 atm × 2.50 L) ÷ 0.575 L

    = 4.3478 atm

     = 4.35 atm

Therefore, the new pressure of the gas is 4.35 atm

6 0
3 years ago
Read 2 more answers
How many moles of ZnCl, will be produced from 23.0 g of Zn, assuming CuCl, is available in excess?
Dennis_Churaev [7]

Answer:

23 g of Zn will produce 0.352 mole of zinc chloride.      

Explanation:

Given data:

mass of Zn = 23 g

Moles of ZnCl = ?

Solution:

Chemical equation:

2Zn + CuCl₂ → 2ZnCl + Cu

Number of moles of Zn:

<em>Number of moles of Zn = mass/ molar mass</em>

Number of moles of Zn = 23 g / 65.38 g/mol

Number of moles of Zn = 0.352 mol

now we will compare the moles of ZnCl with Zn because it is limiting reactant.

                         Zn       :      ZnCl  

                         2         :        2

                         0.352 :        0.352

So 23 g of Zn will produce 0.352 mole of zinc chloride.      

7 0
4 years ago
In titrating 0.20 M hydrochloric acid, HCl, with 0.20 M NaOH at 25°C, the solution at the equivalence point is
xxTIMURxx [149]

Answer:

c) 0.10M NaCl

Explanation:

<em>Options are:</em>

<em>a) 0.20M NaCl</em>

<em>b) Very acidic</em>

<em>c) 0.10M NaCl</em>

<em>d) 0.10M HCl + 0.20M NaOH</em>

<em>e) Slightly acidic.</em>

<em />

Based on the reaction:

NaOH + HCl → H₂O + NaCl

You can see than 1 mole of NaOH reacts per mole of HCl producing 1 mole of NaCl

Assuming 1L of 0.20M HCl reacts with 1L of NaOH, moles of both compounds are:

1L * 0.20mol/L = 0.20 moles reacts. That means moles of NaCl produced are 0.20moles in 2L. Molarity of NaCl is:

0.20mol / 2L = 0.10M NaCl

That means, right option is:

<h3>c) 0.10M NaCl</h3>

8 0
3 years ago
A copper wire is left outside on the ground for several weeks. Which
LiRa [457]

Answer:

c

Explanation:

the oxygen in the air and water from the rain caused oxidation causing the copper wire to become tarnished.

5 0
3 years ago
Read 2 more answers
a gap in the rock layer due to erosion from no rocks being deposited.HELP FAST PLEASE!?!?!?!?
Allushta [10]

a gap in the rock layer due to erosion or from no rocks being deposited

geological processes taking place today are the same as those that occurred in the past.  

fossil that record the shape and structure of an organism

each layer is older than the layer above and younger than the layer below it.

the preserved remains or traces of a once living organism.

fossils that record the movement or behavior of an organism.

sediments spread in all directions until they thin out or hit a barrier.

sedimentary rocks are deposited horizontally.

age of rock compared to the ages of rock layers.

age of rocks calculated in years since formed.

words:

1.absolute age

2.body fossil

3.fossil

4.principle of lateral continuity

5.principle of original horizontally

6.principle of superposition

7.relative age  

8.trace fossil

9. unconformity

10.uniformitarianism

Answer is 9,10,2,6,3,8,4,5,7,1

All my answers were correct on this one

6 0
4 years ago
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