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Kitty [74]
3 years ago
5

Ayudaaaaaaaaaaaaaaaaa​

Chemistry
1 answer:
nataly862011 [7]3 years ago
5 0

Answer:

es procariota la 1 creo

Explanation:

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Calculate the number of joules released when 72.5 grams of water at 95.0 degrees Celsius cools to a final temperature of 28.0 de
Airida [17]
Water's specific heat capacity is 4200 J/Kg°C
95-28=67
72.5grams in kg is 0.0725kg
Energy = 67×0.0725×4200
Energy = 20,401.5 J or 20.4015 kJ
7 0
3 years ago
The formula weight of a compound is determined by adding up the individual weights of every _______ in that compound.
Jlenok [28]

Answer:

C. Atom

The formula weight is calculated by the sum( adding) of the atomic masses for every atom in the formula

3 0
3 years ago
Stoichiometry is best defined as the
Oxana [17]

Stoichiometry is “quantitative relationship” among the “reactants” and the “products” in a “chemical reaction”.

<u>Explanation</u>:  

In stoichiometry “stoicheion” means element and “metron” means measure in Greek. The stoichiometric calculation depends upon “stoichiometric coefficients” in a “chemical equation” which can be explained as the “number of moles” of each substance (reactants or products). Stoichiometric calculation is done as follows:

For example reaction between nitrogen and hydrogen to form ammonia as

\mathrm{N}_{2}(\mathrm{g})+3 \mathrm{H}_{2}(\mathrm{g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{g})

Here stoichiometric coefficients show that “one molecule of nitrogen” reacts with “three molecules of hydrogen” to form “two molecules of ammonia”. Multiplying Avogadro number 6.022 \times 10^{23} to no of molecules in equation:

\text { For } \mathrm{N}_{2}: 1 \times 6.022 \times 10^{23}=1 \mathrm{mol}

\text { For } 3 \mathrm{H}_{2}: 3 \times 6.022 \times 10^{23}=3 \mathrm{mol}

\text { For } 2 \mathrm{NH}_{3}: 2 \times 6.022 \times 10^{23}=2 \mathrm{mol}

Taking molar masses into consideration:  

\text { For } \mathrm{N}_{2}: 1 \times 28.0=28.0 \mathrm{gm}

\text { For } 3 \mathrm{H}_{2}: 3 \times 2=6.0 \mathrm{gm}

\text { For } 2 \mathrm{NH}_{3}: 2 \times 17=34 \mathrm{gm}

Hence balanced equation gives stoichiometric coefficients which gives proportion by moles.

8 0
3 years ago
How many joules of energy does it take to melt 35g of ice at 0.0c?
umka21 [38]
Hv= heat of vapourization of water= 2260J/g
heat=2260*35
=79100 J
6 0
3 years ago
What is the basic unit of all matter? O A. neutron O B. atom KDC. electron OD proton NUNE nucleus Reset Next​
Salsk061 [2.6K]

Answer:

Atom

Explanation:

atom: The basic unit of matter; the smallest unit of an element, having all the characteristics of that element; consists of negatively-charged electrons and a positively-charged center called a nucleus.

7 0
3 years ago
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