Use the information to answer the following question. Students are trying to calculate the heat of reaction for the following target reaction.
A + 3B → 3C + 2D
They find the heat of reactions for the two reactions as shown.
A + 2B → C + D ΔH= -20 kJ

B → 2C + D ΔH= -45 kJ

When the students used Hess’s Law correctly, what is the heat of reaction for the target reaction?

A.
+65 kJ

B.
+25 kJ

C.
-65 kJ

D.
-25 kJ

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

Vi limitens. vastery test select the correct answer. which statement explains why large atoms are more reactive than small atoms? a. large atoms have valence electrons farther from the nucleus and lose them more readily. b. large atoms have greater ionization energy, which they can utilize during a reaction. c. large atoms have a greater number of electrons that they can lose during a reaction. d. large atoms have more energy levels, so they have more energy to pass on in a reaction. reset next

The chemical formula for emerald is be3al2(sio3)6.an emerald can be decided as