What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of
heat is applied?
Use q=mC. AT
O 0.00420 J/(g•°C)
O 0.00661 J/(g. °C)
238 J/(g. °C)
O 252 J/(g. °C)

Idon't hope someone you

The correct answer is weight.

It would be true sodium reacts with water in a violent way 

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -