Answer:
they must do a background check
Explanation:
they need to check the liscence and do a small interrigaition
Answer:
THIS IS YOUR ANSWER :
<em>Science</em><em> </em><em>is a study of </em><em>nature</em><em> </em><em>human beings plants animals chemicals and</em><em> </em><em>machines</em><em> </em>
<em>and</em><em> </em><em>pHySiCs is a part of science</em><em> </em>
<em>✍️</em><em>HOPE</em><em> </em><em>IT HELPS YOU</em><em> </em><em>✍️</em>
Answer:
ΔH = 125.94kJ
Explanation:
It is possible to make algebraic sum of reactions to obtain ΔH of reactions (Hess's law). In the problem:
1. 2W(s) + 3O2(g) → 2WO3(s) ΔH = -1685.4 kJ
2. 2H2(g) + O2(g) → 2H2O(g) ΔH = -477.84 kJ
-1/2 (1):
WO3(s) → W(s) + 3/2O2(g) ΔH = 842.7kJ
3/2 (2):
3H2(g) + 3/2O2(g) → 3H2O(g) ΔH = -716.76kJ
The sum of last both reactions:
WO3(s) + 3H2(g) → W(s) + 3H2O(g)
ΔH = 842.7kJ -716.76kJ
<h3>ΔH = 125.94kJ </h3>
Means that the African continent was once in the higher latitudes, and in contact with Antarctica, where glaciers form due to the low temperatures in the poles. The continent drifted over time due to tectonic plate movement. Continental drift is powered by the convection current in the mantle of the earth.
Answer:
1610.7 g is the weigh for 4.64×10²⁴ atoms of Bi
Explanation:
Let's do the required conversions:
1 mol of atoms has 6.02×10²³ atoms
Bi → 1 mol of bismuth weighs 208.98 grams
Let's do the rules of three:
6.02×10²³ atoms are the amount of 1 mol of Bi
4.64×10²⁴ atoms are contained in (4.64×10²⁴ . 1) /6.02×10²³ = 7.71 moles
1 mol of Bi weighs 208.98 g
7.71 moles of Bi must weigh (7.71 . 208.98 ) /1 = 1610.7 g
