Question

How many moles of NO2 are needed to increase the temperature of a 333-gram block of iron from 22⁰C to 1300⁰C? (specific heat of iron is 0.49 J/g⁰C)

a) 9.48 moles
b) 6.84 moles
c) 8.16 moles
d) 10.32 moles

Answer 1

To calculate the amount of heat required to increase the temperature of the iron block, use the formula q = mcΔT. Substitute the values into the formula to calculate the heat.

Step-by-step explanation:

To calculate the amount of heat (q) required to increase the temperature of the 333-gram block of iron from 22⁰C to 1300⁰C, we can use the formula q = mcΔT, where q is the heat, m is the mass, c is the specific heat, and ΔT is the change in temperature.

First, calculate the change in temperature: ΔT = final temperature - initial temperature = 1300⁰C - 22⁰C = 1278⁰C.

Substitute the values into the formula: q = (333 g)(0.49 J/g⁰C)(1278⁰C) = 210,816 J.