When 1564 J of heat energy is added to a sample of gold at 25.0°C, the temperature of the gold increases to 449°C. what is the means of the gold sample? (specific heat of gold= 0.129 J/g-°C

The mass of the gold sample is 28.59 g

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system. The amount of heat received or transferred by a body when it undergoes a temperature variation (Δt) without changing its physical state (solid, liquid or gaseous) is calculated by:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

Solving:

m=28.59 g

The mass of the gold sample is 28.59 g

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

c. electrical charges of ionic bonds.