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goblinko [34]
3 years ago
9

5.25 calories are absorbed by an iron nail. How many joules is this?

Chemistry
1 answer:
aniked [119]3 years ago
7 0

Answer:

D) 21.9

Explanation:

1 kilocalorie is equal to 4184 joules

0.001 kilocalorie is equal to 1 calorie

so 5.25 calorie=21.966 joules

You might be interested in
Una muestra de 2,5000 (g) de piedra caliza, se disuelve y se precipita el Calcio como oxalato de Calcio (CaC2O4), este precipita
sergij07 [2.7K]

Answer:

\%Ca=19.378\%

Explanation:

¡Hola!

En este caso, basado en la información dada, es posible conocer la masa de calcio en carbonato de calcio, que de hecho es la misma en la muestra, al utilizar el siguiente esquema de cálculo:

m_{Ca}=1,2093gCaCO_3*\frac{1molCaCO_3}{100.1gCaCO_3}*\frac{1molCa}{1molCaCO_3}*\frac{40.1gCa}{1molCa}\\\\m_{Ca}=0.48444gCa

Finalmente, calculamos el porcentaje requerido como sigue:

\% Ca=\frac{0.48444g}{2.5000g} *100\%\\\\\%Ca=19.378\%

¡Saludos!

4 0
3 years ago
15) The chemical formula of a compound indicates the
scZoUnD [109]
Oh ok I miss you and I am so
6 0
2 years ago
How is nuclear chemistry relevant to your everyday life?
tigry1 [53]
How? Well radiation can be used to improve everyday life. Nuclear energy can be used in medicine and as tools of treatment, especially for cancer, and trace the movement of atoms in biological systems. 
Hope i got the answer correct....
6 0
3 years ago
What is the name of the following compound? Se5S6
inessss [21]

Answer:

I'm sorry I couldn't find it, I looked all over the internet

5 0
2 years ago
. Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:
barxatty [35]
A. HCl:
pH= -log [H3O+]
PH=-log (0.200)
= 0.699

poH= 14-0.699
= 13.301

b. NaOH:
PoH= -log [OH-]
= -log (0.0143)
= 1.845
pH= 14-poH
= 14- 1.845
= 12.16

c. HNO3:
PH= -log[H3O+]
=-log(3.0)
= -0.4771
poH= 14-pH
= 14-9-0.4771
= 14.4771

pH= -0.4771, poH= 14.4771

d. [Ca(OH)2] = 0.0031M
[OH-]= 2X0.0031
[OH-] = 0.0062M

PoH= - log[OH-]
=-log(0.0062)
=-log(6.2x10-3)
=-(-2.21)
= 2.21
PH=14-poH
=14-2.21
=11.79
POH=2.21, PH= 11.79
5 0
2 years ago
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