Q=mc\Delta T
Q= 40.5g x 0.900 J/g degree Celsius x 7.5
Q= 273.4 J.
Even if it is cooled , we use the same temperature as heating it.
The number of moles is simply calculated by taking the ratio of mass over the molar mass. The molar mass of silver nitrate AgNO3 is 169.87 g/mol. Therefore:
number of moles AgNO3 = 100 g / (169.87 g/mol)
number of moles AgNO3 = 0.59 moles
2Al(No3)3(aq) + 3Ba(OH)2(aq) ------------> 2Al(OH)3(s) + 3Ba(NO3)2(aq)
Ca(s) + ZnBr2(aq) -------------------> Zn(s) + CaBr2(s)
CuSO4(aq) + Na2S(aq) --------------> CuS(s) + Na2SO4(aq)
KBr(aq) + Pb(Cl3)2(aq) -----------------> PbBr2(s) + K(ClO3)(aq)
Answer:
c, often , fossil remains of a large complex animal are incomplete
