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tamaranim1 [39]
3 years ago
13

2. Carbon-11 is a radioactive isotope of carbon. Its half-life is 10 minutes.

Chemistry
1 answer:
Annette [7]3 years ago
5 0
It’s probably probably 01/16 because of the other number don’t make sense except that one
You might be interested in
Of the following equilibria, only ________ will shift to the right in response to a decrease in volume. N2 (g) + 3H2 (g) 2NH3 (g
igomit [66]

Answer:

Of the following equilibria, only one will shift to the right in response to a decrease in volume.

N_2 (g) + 3H_2 (g)\rightleftharpoons 2NH_3 (g)

On decreasing the volume the equilibrium will shift in right direction due to less number of gaseous moles on product side.

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

Decrease the volume

If the volume of the container is decreased , the pressure will increase according to Boyle's Law. Now, according to the Le-Chatlier's principle, the equilibrium will shift in the direction where decrease in pressure is taking place. So, the equilibrium will shift in the direction number of gaseous moles are less.

N_2 (g) + 3H_2 (g)\rightleftharpoons 2NH_3 (g)

On decreasing the volume the equilibrium will shift in right direction due to less number of gaseous moles on product side.

2 Fe_2O_3 (s) \rightleftharpoons 4 Fe (s) + 3O_2 (g)

On decreasing the volume the equilibrium will shift in left direction due to less number of gaseous moles on reactant side.

2 SO_3 (g) \rightleftharpoons 2 SO_2 (g) + O_2 (g)

On decreasing the volume the equilibrium will shift in left direction due to less number of gaseous moles on reactant side.

H_2 (g) + Cl_2 (g) \rightleftharpoons 2 HCl (g)

On decreasing the volume the equilibrium will shift in no direction due to same number of gaseous moles on both sides.

2HI (g) \rightleftharpoons H_2 (g) + I_2 (g)

On decreasing the volume the equilibrium will shift in no direction due to same number of gaseous moles on both sides.

8 0
3 years ago
1.How many mL of 0.523 M HBr are needed to dissolve 8.60 g of CaCO3?
prohojiy [21]

Answer:

The answer to your question is:

Explanation:

1.-

HBr = 0.523 M   V = ?

CaCO3 = 8.6 g

                   2HBr(aq) + CaCO₃(s)     ⇒   CaBr₂(aq) + H₂O(l) + CO₂(g)

MW CaCO₃ = 40 + 12 + 48 = 100 g

MW HBr = 80 + 1 = 81 g

Molarity = moles / volume

                          100 g of CaCO₃ ----------------  1 mol

                            8.6 g                 ----------------   x

                            x = (8.6 x 1) / 100

                            x = 0.086 moles

                  2 moles of HBr ----------------- 1 mol of CaCO₃

                 x                         -----------------  0.086 moles

                 x = (0.086 x 2) / 1 = 0.172 moles of HBr

Volume = moles / molarity

Volume = 0.172/ 0.523 = 0.323 l or 323 ml of HBr

2.-

V = ? ml   NaOH 0.487 M

V = 101 ml of 0.628 M MnSO₄

                 MnSO₄(aq)  +  2NaOH(aq)  ⇒    Mn(OH)₂(s) + Na₂SO₄(aq)

MW MnSO₄ = 55 g

MW NaOH = NaOH = 40 g

Moles = Molarity x volume

Moles = (0.628) x (0.101)

Moles = 0.065 moles of MnSO₄

               1 mol of MnSO₄  ------------------ 2 moles of NaOH

               0.065                 -----------------   x

               x = (0.065x 2) / 1

              x = 0.131 moles of NaOH

Volume = moles / molarity

Volume = 0.131 / 0.487

Volume = 0.268 l or 268 ml of NaOH

4 0
3 years ago
Which gas has. an atomic mass of 15.999​
sveticcg [70]

Answer: Oxygen (O)

Explanation:

8 0
3 years ago
Read 2 more answers
Scientists publish a revised list of dangerous greenhouse gases. Which statements describe the importance of this information? C
Pie

Answer:

It leads to new jobs that search for innovative ways to control emissions.

Explanation:

Publishing a report that is a revised list of green house gases by scientists underscores the importance of new new jobs that seek ways of controlling emissions. The publication will inspire scientific research into control of emission of greenhouse gases. This will create new jobs for scientists who will be charged with the responsibility of ensuring that emission of Tue newly discovered greenhouse gasses is greatly reduced.

Several scientists earn a living by actively carrying out research on control of the emission of greenhouse gasses.

8 0
4 years ago
Applying the rules of significant figures, which of the following would be the correct value for the density of a substance whic
lilavasa [31]

16 g/ml

<h3>Further explanation</h3>

Given

mass = 32.40 g

volume = 2.0mL

Required

Density

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}

ρ = density  

m = mass  

v = volume  

Input the value :

ρ = 32.40 g / 2.0 ml

ρ = 16.2 g/ml

Rules for division: The least number of significant figures in the problem determines the number of significant figures in the answer.

32.40 = 4 sig.fig

2.0 = 2 sig fig

The answer must be 2 sig fig

So the answer = 16 g/ml

6 0
3 years ago
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