Answer:
nH2SO4 = 0,1 mol
Đặt nNaOH = a; nKOH = 3a (mol)
Quy đổi phản ứng thành: {X, H2SO4} + {NaOH, KOH} → Muối + H2O
Ta có: nH+ = nOH- → 2nX + 2nH2SO4 = nNaOH + nKOH
→ 2.0,1 + 2.0,1 = a + 3a → a = 0,1
→ nH2O = nH+ = nOH- = 0,4 mol
BTKL: mX + mH2SO4 + mNaOH + mKOH = m muối + mH2O
→ mX + 0,1.98 + 0,1.40 + 0,3.56 = 36,7 + 0,4.18 → mX = 13,3 gam
→ MX = 13,3/0,1 = 133
→ %mN = (14/133).100% ≈ 10,526%
A 3 sig figs
B 6 sig figs
C 2 sig figs
D 5 sig figs
C, A, D, B
Groups 13-16, hope this helps!
I'm actually not sure... but maybe this will help!
http://www.dummies.com/education/science/chemistry/how-to-identify-chiral-centers-in-a-molecule/
Answer:
thermal energy: the part of total internal energy that can be transferred (a portion of the kinetic energy)
heat is the thermal energy that flows from one substance to another due to a temperature difference.
Thermal energy is measured in temperature change.
Thermal energy transfer stops when thermal equilibrium is achieved (Both substances at the same temperature).
conduction: Transfer of thermal energy through a solid object like heat transferring up a metal spoon from a hot cup of coffee.
convection: the transfer of thermal energy due to the movement of a liquid or gas caused by differences in temperature. Only in a fluid (liquid or gas). Breezes, ocean currents.
radiation: Transfer energy with or without matter. Warming from the Sun, microwave oven.
