3 years ago

Calculate the number of kilojoules to warm 125 grams of iron from 23.5 degrees Celcius to 78 degrees Celcius

1 answer:

3 0

Q=mcΔT

q=(125g)(0.446 J/(g x °C))(78°C - 23.5°C)

q=(125 g)(0.446 J/(g x °C))(54.5°C) (Be sure to cancel all similar units)

q= 3038.375 J

You might be interested in

Do two objects with the same mass always have the same volume

Vika [28.1K]

5 0

2 years ago

Consider the chemical equation for the ionization of CH3NH2 in water. Estimate the percent ionization of CH3NH2 in a 0.050 M CH3

anyanavicka [17]

Answer: The percent ionization of $CH_3NH_2$ in a 0.050 M $CH_3NH_2(aq)$ solution is 8.9 %

Explanation:

$CH_3NH_2+H_2O\rightarrow OH^-+CH_3NH_3^+$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_b=\frac{(c\alpha)^{2}}{c-c\alpha}$

Give c= concentration = 0.050 M and $\alpha$ = degree of ionisation = ?

$K_b=4.4\times 10^{-4}$

Putting in the values we get:

$4.4\times 10^{-4}=\frac{(0.050\times \alpha)^2}{(0.050-0.050\times \alpha)}$

$(\alpha)=0.089$

percent ionisation = $0.089\times 100=8.9\%$

8 0

2 years ago

Which example best shows conservation of resources?

zaharov [31]

Answer:

Explanation:

I took this test as a freshman and this was the only question of 4 that I can remember

6 0

3 years ago

Read 2 more answers

What volume of 0.20 M solution of HCI will be required to neutralize 10.0 mL of a 0.60 M

tatyana61 [14]

Answer:

30ml

Explanation:

Chcl.Vhvl=Ckoh.Vkoh

4 0

2 years ago

EXPLAIN why a skateboard coasting on a flat surface slows down and comes to a stop

ankoles [38]

A skateboard coasting on a flat surface slows down and then comes to a stop because the skateboard runs out of energy, and slows down, also, sense it is on a flat surface and not going downhill, it goes slower.

6 0

2 years ago