Question

A microwave oven supplies 1.000 kJ per second. How many minutes should be set on the microwave in order to heat 250. g of water from 24.3°C to its boiling point?
Incorrect Response
1) 2.54 minutes
Correct Answer
2) 1.32 minutes

3) 79.2 minutes

4) 0.424 minutes

Answer 1

q=mCdeltaT

once you find q, divide the amount of heat generated by the microwave per second.

Answer 2

how am i finding the deltat?

Answer 3

when i did that equation i came up with 459756..if i divided by 1.000kj my answer was 2.17 x10 to the -6

Answer 4

doesn't seem right

Answer 5

it says bring to the boiling point of your solvent, which is water, whats the boiling point of water?

Answer 6

99.98C

Answer 7

lol what, no it's 100 celsius

Answer 8

delta t = 75.68

Answer 9

okay so you multiplied everything, and got?

Answer 10

ugh!!! google said 99.98.....ok..i'll work the equation with 100C

Answer 11

99.98 is not gonna make a huge difference

Answer 12

i got 459877.5

Answer 13

units?

Answer 14

my heat...that was the answer for q=

Answer 15

459877.5 cats?

Answer 16

no..heat

Answer 17

heat is not a unit

Answer 18

i know..but the equation u gave me was for heat

Answer 19

Use Q=m.C.deltaT where C is 4.18 J/g.c and deltaT is 75.7(if the boiling point of water is 100 c)then divide the answer by 1000 J ....then divide it by 60 in order to find the time in minutes.

Answer 20

Is that helpful...?

Answer 21

it was..thank you

Answer 22

An atom of zinc has a mass of 65.39 amu. One of its isotopes, image038, has an 18.75% abundance. Since 1 amu = 1.6606 x 10-24 g, how many of atoms of this zinc isotope would be present in a 1.00 g sample of zinc?
Question 25 options:

1) 9.209 x 1021 atoms

2) 4.911 x 1022 atoms

3) 1.727 x 1021 atoms

4) 4.762 x 1021 atoms