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creativ13 [48]
3 years ago
14

(WILL GIVE BRAINLIEST IF YOU ANSWER ALL 4) Chemistry

Chemistry
1 answer:
Kitty [74]3 years ago
5 0

Answer:

See explanations

Explanation:

a. Molarity = moles/Volume in Liters = 5moles/2Liters = 2.5M in NaCl

b. Freezing Pt Depression

     1. Sprinkling salt on icy surfaces

    2. Using antifreeze in automobile cooling systems

    3. <em>Not an application </em>

    4. Using salt to make ice cream

c. pOH = -log[OHˉ] = -log(1x10ˉ¹⁰) = -(-10) = 10 => pH = 14 – pOH = 14 – 10 = 4

d. H₂O + NH₃ => NH₄⁺ + OHˉ => Bronsted Acid is H₂O  (proton donor)

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How many 500 mg tablets of acetaminophen would be a lethal dose for a 132 lb adult
ivann1987 [24]

Answer:

About 2000 mg so 4 pills

could kill

Explanation:

7 0
3 years ago
When H2(g) reacts with O2(g) to form H2O(g) , 242 kJ of energy are evolved for each mole of H2(g) that reacts. Write a balanced
algol [13]

Answer:

2H2(g) + O2(g) --------> 2H2O(g). ∆H= -242KJmol-1

Explanation:

A thermochemical equation is a balanced chemical reaction equation that includes the physical states of all reactants and products and the energy change.

As shown above, hydrogen reacted with oxygen in the gas phase to form water, an energy of 242KJ was evolved and we are required to put this in a thermochemical equation using the least coefficients.

Hydrogen reacts with oxygen to form water in the gas phase in a least ratio of 2:1 as shown in the answer.

The term 'energy evolved' in the question means that the reaction is exothermic and energy is evolved. Hence ∆H is negative as shown.

6 0
3 years ago
A compound contains 39.0% potassium, 1.01% hydrogen, 12.0% carbon and 47.9% oxygen. Find its empirical formula
Ipatiy [6.2K]

Answer:

Empirical formula is  KHO₃C.

Explanation:

Given data:

Percentage of potassium = 39.0%

Percentage of hydrogen = 1.01%

Percentage of carbon = 12.0%

Percentage of oxygen = 47.9%

Empirical formula = ?

Solution:

Number of gram atoms of K = 39.0/ 39 = 1

Number of gram atoms of H = 1.01 / 1.01 = 1

Number of gram atoms of O = 47.9 / 16 = 3

Number of gram atoms of C = 12 / 12 = 1

Atomic ratio:

K               :            H                  :      O            :      C

1/1              :             1/1                :     3/1          ;       1/1

 1              :              1                  :        3          :        1

K : H : O :C =  1: 1 : 3 : 1

Empirical formula is  KHO₃C.

4 0
4 years ago
Alll moving objects have energy of _________
Natasha_Volkova [10]
All moving objects have kinetic energy.

Kinetic energy is the energy of motion, therefore if an object is moving it has kinetic energy.
3 0
3 years ago
Iodide (KI). Identify the correct products of this
TEA [102]

Answer:

AgNO3 + KI → Agl + KNO3. Double-replacement reaction

Explanation:

Based on solubility rules, Silver, Ag produce an insoluble salt in presence of halides (Fluorides F-, Chlorides Cl-, Iodides, I-, and bromides Br-). That means the mixture of AgNO3 (Ag⁺ ions) with KI (I- ions) produce AgI as insoluble salt.

The reaction is:

<h3>AgNO3 + KI → Agl + KNO3</h3><h3 />

And this is a double-replacement reaction where the cations exchange of anion to produce 2 new compounds.

4 0
3 years ago
Read 2 more answers
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