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Natalka [10]
3 years ago
15

How much heat do you need to raise the temperature of 100g of aluminum from 30 C to 150 C

Chemistry
2 answers:
marysya [2.9K]3 years ago
5 0

Answer:

The Answer is actually 10.8 kJ

Explanation:

It's not -10.8 KJ y'all, do NOT get confused. I got it wrong when I wrote -10.8 KJ. I took the test and it's 10.8 KJ without the negative.

SVEN [57.7K]3 years ago
4 0

Answer:

Q = 10.8 KJ

Explanation:

Given data:

Mass of Al= 100g

Initial temperature = 30°C

Final temperature = 150°C

Heat required = ?

Solution:

Specific heat of Al = 0.90 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 150°C - 30°C

ΔT = 120°C

Q = 100g×0.90 J/g.°C× 120°C

Q = 10800 J       (10800j×1KJ/1000 j)

Q = 10.8 KJ

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Two isotopes of hypothetical element X exist with abundances of 30.00% 100X and 70.00% 101X. What is the approximate atomic mass
Rasek [7]

Answer:

C. 100.7 amu

Explanation:

Isotopes of an element are atoms of an element with the same atomic number but different atomic masses. Each atomic mass of an isotope is known as an isotopic mass. An element that exhibits isotope, that is, that have two or more isotopes has a relative atomic mass that is not a whole number.

Relative atomic mass of X is the sum of the products of the relative abundances of each isotope and its isotopic mass.

For Isotope ¹⁰⁰X: 30% × 100 = 30 amu

For Isotope ¹⁰¹X: 70% × 101 = 70.7 amu

Relative atomic mass of X = (30 + 70.7) amu = 100.7 amu

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4 0
2 years ago
Which of the following compounds are ionic compounds? Check all of the boxes that apply.
Lady_Fox [76]

Answer:

NaCl is the one of the example of ionic compound because na conducts positive charge and CL conduct negative charge

3 0
2 years ago
If you are at the top of Mount Everest, can you have a really hot cup of hot chocolate?
matrenka [14]

Answer:

Yes, you can

Explanation:

When you climb Mount Everest, you need lots of energy. The higher you climb, the more your appetite goes down. You will need as much energy as you can get.

7 0
2 years ago
Given the balanced reaction: Zn + 2HCl H2 + ZnCl2 How many grams of zinc are needed to produce 5 grams of H2?
kumpel [21]

Answer:

161.9gZn

Explanation:

Hello there!

In this case, according the given balanced chemical reaction:

Zn + 2HCl\rightarrow  H_2 + ZnCl_2

It is possible to evidence the 1:1 mole ratio of hydrogen (molar mass = 2.02 g/mol) to zinc (atomic mass = 65.41 g/mol) which is used to calculate the grams of the latter needed for the production of 5 grams of the former via stoichiometry:

5gH_2*\frac{1molH_2}{2.02gH_2}*\frac{1molZn}{1molH_2} *\frac{65.41gZn}{1molZn}\\\\=161.9gZn

Best regards!

5 0
3 years ago
When 2.0 mol h2o react with 2.0 mol fe in the reaction below, 1.5 mol of fe are used up in the reaction. how many moles of fe ar
GalinKa [24]
The answer is 0.5 mol Fe left over.
Hope this helped! (:
7 0
3 years ago
Read 2 more answers
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