Answer:
= 7234.5Joules
Explanation:
Q = (mcΔT)ice + (mΔH)melting +(mcΔT)water
= (10.5g)(2.06J/g°C)[0°C-(-20°C)+(10.5g)(2257J/g)+(10.5g)(4.184J/g°C(75°C - 0°C)
= [(10.5)(2.06)(20) + (10.5)(2257) + (10.5)(4.184)(75)]J
= 432.6J + 3507J + 3294.9J
= 7234.5Joules
Your answer cannot be MORE precise than the least precise measurement. The following rule applies for multiplication and division: The LEAST number of significant figures in any number of the problem determines the number of significant figures in the answer.
Answer:
3.4225 * 10^-8
Explanation:
This is just another way to write a number in scientific notation.
