758 j of heat are added to 0.750 kg of copper. how much does its temperature change?(unit=degrees c) PLEASE HEL M

Explanation:

When a certain amount of heat energy is supplied to a substance, the temperature of the substance increases according to:

where

Q is the amount of heat energy supplied

m is the mass of the substance

C is the specific heat capacity of the substance

is the change in temperature

In this problem:

Q = 758 J is the heat supplied

m = 0.750 kg is the mass

is the specific heat of copper

Solving for , we find the increase in temperature:

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂