Answer:
pv=nrt solution re solve it
When it has been disproven
Answer:
It will take 140.76 seconds to swim 0.150 miles.
Explanation:
Distance covered by man by swimming for t time= d
d = 1500.0 miles
t = 14 minutes + 34.56 seconds
1 min = 60 seconds
t = 14 × 60 seconds + 34.56 seconds = 874.56 seconds
Speed of the man while swimming = S = 
If the man swims 0.150 miles with the same speed ,then the time taken by him be T.
0.150 miles = 0.150 × 1609.34 m = 241.401 m
(1 mile= 1609.34 meters)
T = 140.76 seconds
It will take 140.76 seconds to swim 0.150 miles.
Answer:
The unknown element is Sb
Explanation:
The first thing we must note is that the unknown element must be a member of group 15 in the periodic table. This is clear from the fact that the two oxides formed are X2O3 and X2O5. This implies that the unknown element X must have a valency of 3 or 5. This corresponds to our knowledge that the outermost electron configuration of group 15 elements is ns2np3. Hence, group fifteen elements can have a valency of 3 or 5.
The electronic configuration of antimony is; [Kr]4d10 5s2 5p3. This implies that the atom is paramagnetic since there are three unpaired 5p electrons. The oxides of antimony are known to be amphoteric. An ampohoteric oxide reacts with both acid and base, hence the answer.
b. Na2HPO4 + NaH2PO4.
A <em>buffer </em>is a solution of a weak acid and its conjugate base. The weak acid is H2PO4^(-) and its conjugate base is HPO4^(2-).
All the other options are incorrect because they consist of only a single component.
