At 0 Kelvin, gas particles do not possess any kinetic energy. TRUE FALSE

If you have a mole of carbon atoms, how many atoms do you have?

Aleonysh [2.5K]

Answer:

6.02×10^23 atoms

Explanation:

Avogadros constant is a number that states the amount of atoms in one mole of a substance which is 6.02×10^23 to 3 significant figures.

8 0

2 years ago

Radium-221 has a half-life of 30 sec. How long will it take for 96% of a sample to decay?

monitta

We can calculate how long the decay by using the half-life equation. It is expressed as:

A = Ao e^-kt

where A is the amount left at t years, Ao is the initial concentration, and k is a constant.
From the half-life data, we can calculate for k.

1/2(Ao) = Ao e^-k(30)
k = 0.023

0.04Ao = Ao e^0.023(t)
t = 140 sec

3 0

3 years ago

The balanced redox reactions for the sequential reduction of vanadium are given below.

Minchanka [31]

Answer : 0.0392 grams of Zn metal would be required to completely reduced the vanadium.

Explanation :

Let us rewrite the given equations again.

$2VO_{2}^{+} (aq)+ 4H^{+}(aq) + Zn (s)\rightarrow 2VO^{2+}(aq)+Zn^{2+}+2H2O(l)$ $2VO^{2+}(aq)+ 4H^{+}(aq) + Zn (s)\rightarrow 2V^{3+} (aq)+Zn^{2+}+2H2O(l)$