Answer:. Ca should displace Mn
Explanation:
Calcium is high up in the activity series of metals. Calcium has a very negative redox potential of -2.87 V, next only to potassium. Transition metals of which Manganese is one, does not have such very negative redox potentials so they can easily be displaced by a more highly reactive metal such as Calcium. Elements of group 1 and 2 are very highly reactive.
Percent composition by mass of oxygen =
((16.0*6)/(40.1+2*(14.0+16.0*3)))*100%
= 58.5%
therefore, the answer is D
Answer:
A compound is just pure that is composed of elements that are chemically bonded in definite proportions
andd solution is umm well its a homogenous so basically saying
that it all just stays the same all the way through
Explanation:
im not sure how else to explain it haah hope this helped :P
Answer:
T₂ = 464.75 K
Explanation:
Given data:
Initial Temperature = 398.15 K
Pressure = 248 torr (constant)
Initial Volume = 275 mL (275/1000 = 0.275 L)
Final volume = 0.321 L
Final temperature = ?
Solution:
V₁/T₁ = V₂/T₂
T₂ = V₂ T₁ / V₁
T₂ = 0.321 L × 398.15 K / 0.275 L
T₂ = 127.81 L.K / 0.275 L
T₂ = 464.75 K
<span>The preparation of 40 liters of 0.02 m phosphate buffer, ph 6.9, may be carried out by adding 132g of solid trisodium phosphate to 1290ml of hydrochloric acid (HCl concentration 1 mol/L), then making up to a final liquid volume of 40 liters by adding water.
Method: Weigh out 132 grams of Na3PO4 (s), and add it to 1290 ml 1M HCl (l). Mix, then add water, to a final volume of 40 liters.</span>