we are given the reaction Cu + 2AgNO3 ---> Cu(NO3)2 + 2Ag. This means for every mole Cu used, there are 2 moles of Ag produced. In this case, given 31.75 g Cu, converting to moles through molar mass and using stoichiometric ratio and the molar mass of Ag, the mass Ag produced is 107.9 grams.
Answer:
(b) gas and dust
Explanation:
"The interstellar medium is the stuff between the stars. Made up mostly of hydrogen and helium gas – plus trace amounts of ices, silicate grains, and all the other elements – it contains all the material needed to make stars and planets. It is shaped by stellar winds, dying stars, galactic magnetic fields, and supernova explosions."
"The interstellar medium is filled primarily with hydrogen gas. A relatively significant amount of helium has also been detected, along with smaller percentages of such substances as calcium, sodium, water, ammonia, and formaldehyde . Sizable quantities of dust particles of uncertain composition are present as well."
Answer: b
Explanation: 50% comes from one parent and 50% comes from the other
Answer: 37.8 grams
Explanation:-
As we know that
.................(1)
where,
q = heat absorbed or released
= mass of iron rod = 32.4 g
= mass of water = ?
= final temperature =
= temperature of iron rod =
= temperature of water =
= specific heat of iron rod =
= specific heat of water=
Now put all the given values in equation (1), we get
Therefore, the mass of the water is 37.8 grams
PbCl2 is insoluble in cold water but soluble in hot water