Answer:
0.88mol
Explanation:
The number of moles, n, contained in a substance can be calculated using the formula;
Moles (n) = mass (m) ÷ molar mass (MM)
Molar mass of Magnesium oxide (MgO) = 24 + 16
= 40g/mol
According to the question, Mass of MgO = 35grams
Mole = 35/40
Mole = 0.875
Mole = 0.88mol
The answer is 27.7
According to this equation:
q = M C ΔT
When q= the energy that produced when there is a difference in temperature.
M (g) = amount of the material= 1.900 Kg= 1900 g
ΔT= difference in temperature ( in kelvin or C°)= 4.542 K
C= Specific heat capacity=3.21
∴ q = 1900 * 4.542 * 3.21 = 27701.7 J = 27.7 KJ
