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mixer [17]
4 years ago
6

Plz answer all of these question thanks

Chemistry
1 answer:
gogolik [260]4 years ago
5 0
F
D
F
B
This should help
You might be interested in
Calculate the molarity of a 10.0% (by mass) aqueous solution of hydrochloric acid.
olga2289 [7]

The question is incomplete,the complete question :

Calculate the molality of a 10.0% (by mass) aqueous solution of hydrochloric acid:

a) 0.274 m

b) 2.74 m

c) 3.05 m

d) 4.33 m

e) the density of the solution is needed to solve the problem

Answer:

The molality of a 10.0% (by mass) aqueous solution of hydrochloric acid is 3.05 mol/kg.

Explanation:

10.0% (by mass) aqueous solution of hydrochloric acid.

10 grams of HCl is present in 100 g of solution.

Mass of HCl = 10 g

Mass of solution = 100 g

Mass of solution = Mass of solute + Mass of water

Mass of water = 100 g - 10 g = 90 g

Moles of HCl = \frac{10 g}{36.5 g/mol}=0.2740 mol

Mass of water in kilograms = 0.090 kg

Molality = \frac{0.2740 mol}{0.090 kg}=3.05 mol/kg

The molality of a 10.0% (by mass) aqueous solution of hydrochloric acid is 3.05 mol/kg.

6 0
3 years ago
Which is an example of an exothermic process?
brilliants [131]

wrong it was E. Evaporation of water if your on plato btw

BRAINLY!!!!

4 0
3 years ago
Read 2 more answers
What 6 elements in the periodic table are named after real people?
Romashka [77]
Curium (Cm, 96) – Pierre and Marie Curie einsteinium (Es, 99) – Albert Einsteinfermium (Fm, 100) – Enrico Fermigallium (Ga, 31) – both named after Gallia (Latin for France) and its discoverer, Lecoq de Boisbaudran (le coq, the French word for 'rooster' translates to gallus in Latin)hahnium (105) – Otto Hahn (Dubnium, named for Dubna in Russia, is the IUPAC-accepted name for element 105)lawrencium (Lr, 103) – Ernest Lawrencemeitnerium (Mt, 109) – Lise Meitner<span>mendelevium (Md, 101) – Dmitri Mende</span>

<span>obelium (No, 102) – Alfred Nobel<span>roentgenium (Rg, 111) – Wilhelm Roentgen (formerly Ununumium)</span><span>rutherfordium (Rf, 104) – Ernest Rutherford </span><span>seaborgium (Sg, 106) – Glenn T. Seaborg</span></span>

4 0
3 years ago
What mass of oxygen (O2) forms in a reaction that forms 15.90 g C6H12O6?
Genrish500 [490]
To answer this question, you need to know the chemical equation for making glucose. It should be look like this

 C6H12O6<span>(s) + 6O2(g) -->6CO2(g) + 6H2O(g)

In the equation, the amount of glucose (</span>C6H12O6) is 1 and the amount of oxygen(O2) is 6. But the equation ratio is using moles as a unit. A mole of glucose will weight 180g but a mole of oxygen weight 32g. 

Then, the amount of oxygen forms would be: 6/1 * (15.90g/180g) * 32g= 16.96 grams
4 0
4 years ago
Read 2 more answers
43. Which of the following statements concerning the action of G proteins on adenylate cyclase is true? I. G proteins always ser
ExtremeBDS [4]

Answer:

Some G proteins activate adenylate cyclase, while others inhibit it.

Explanation:

G proteins helps in the signal transduction process that transfer message in the body. GPCRs (G-protein-coupled receptors) are located on the surface membrane of the cell.

The G protein can activates the protein or might deactivate the proteins that helps in the adenylate cyclase. The particular phosphorylation and dephosphorylation process at different sites by the G proteins can result in activation and inactivation of adenylate cyclase.

Thus, the correct answer is option (C).

8 0
4 years ago
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