How many moles of h2 can be produced from x grams of mg in magnesium-aluminum alloy? the molar mass of mg is 24. 31 g/mol?

creativity is the very element in science that helps us understand things. if we didn't have creative minds, we would never conduct experiments that help us discover things.

hope this helps, good luck!:)

Explanation:

9.8 × 10-9 × 10-2

9.8 × 10-2 nm

Diameter of a helium atom = 0.098 nm

Answer:

Impure substances tend to have a slightly lower melting point than the pure substance.

Explanation:

Because boiling point is independent of liquid volume, the boiling point would not vary.

What is boiling point  ?

A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapor pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C.

The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid turns into a vapor is known as the boiling point of a substance

A liquid's boiling point varies depending on the atmospheric pressure in the area. The boiling point of a liquid is lower in a partial vacuum than it is at atmospheric pressure. A liquid's boiling point is lower under low pressure than it is under air pressure. As a result, water boils at 99.97 °C (211.95 °F) at sea level but at 93.4 °C (200.1 °F) at 1,905 m (6,250 ft) altitude under standard pressure. Various liquids will boil at different temperatures at a given pressure.

Because boiling point is independent of liquid volume, the boiling point would not vary.

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Answer:

Some changes cannot be reversed

Answer:

Magnetic Force

Explanation:

All three types can be converted to kinetic energy through a force. Is there more potential energy when a magnet moves with (same direction as) or against (opposite direction from) a magnetic force? There is more potential energy when a magnet moves AGAINST (opposite direction from) a magnetic force.

And So B. is the Right answer

Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.

Answer:

3.45 x 10^5

Explanation:

Answer:

20 moles

Explanation:

we are given the equation, propane is C3H8. I'll put 1 in front of C3H8 to show you the ratios. The right side of the equation is not needed.

1C3H8+ 5O2

1 : 5

4 moles : x moles

working out x:

to get from 1 to 4 in C3H8 multiply by 4, so do the same to the other side for O2

5 × 4 = 20, so 20 moles are necessary to react completely with four moles of propane

Answer:

answer is 125

Explanation:

180-55= 125

Answer:

its b

Explanation:

i got a 100 percent

The products of the combustion of hydrocarbon are carbon dioxide and water. Therefore, option (b) is correct.

A combustion reaction is a reaction that produces fire and takes place at an elevated temperature. It is an exothermic, redox chemical reaction that usually occurs between a fuel and mostly oxygen in the atmosphere.

Examples of Combustion Reactions such as during the combustion of methane reacts with two molecules of oxygen gas to give carbon dioxide and two molecules of water.

\(CH_4(g) + 2O_2(g) \longrightarrow CO_2 (g) + 2 H_2O (g)\)

Oxygen is the main ingredient for the combustion reaction because combustion cannot happen in the absence of oxygen. Complete combustion occurs when a fuel burns completely to produce carbon dioxide and heat with oxygen.

The burning of wood or solid fuels is an example of combustion. The carbon present in wood or coal reacts with oxygen in the air to release heat and form gaseous products.

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The following statement concerning energy transformations is true is option (a) that is increases in entropy reduce usable energy because Total energy is equals,

Total energy=  free Energy + entropy x temperature.

Gibbs free energy denoted by G which is the combination of enthalpy and entropy into a single value. The change in free energy that is equal to the sum of the enthalpy plus the product of the temperature and entropy of the system.

Entropy is defined as the measure of the thermal energy of the system per unit temperature that is unavailable for doing useful work. The amount of entropy is also a measure of the molecular disorder or randomness of a system due to the work is obtained from ordered molecular motion.  It is a measure of disorder and affects all aspects of our daily lives.

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Complete question is,

Which of the following statements concerning energy transformations is true?

a. increases in entropy reduce usable energy

b. energy must be created during transformation

c. potential energy increases with each transformation

d. increases in temperature decrease total amount of energy available

e. decreases in entropy reduce usable energy

Answer:

Im going to say sleep

Explanation:

Answer:

v=1

w=4

x=1

y=2

z=2

Explanation:

Cu +4HNO₃ ⇒ Cu(NO₃)₂ + 2NO₂+ 2H₂O

Answer:

5.80 M

Explanation:

In this problem, the solute is NaCl and the solvent is water. To find the molality, you need to (1) convert grams NaCl to moles NaCl (via molar mass), then (2) convert grams H₂O to kilograms H₂O, and then (3) calculate the molality (via molality equation). The final answer should have 3 sig figs to match the sig figs of the given values.

(Step 1)

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

14.3 grams NaCl                1 mole
--------------------------  x  ------------------------  =  0.245 moles NaCl
                                     58.443 grams

(Step 2)

1,000 g = 1 kg

42.2 grams H₂O                 1 kg
--------------------------  x  -----------------------  =  0.0422 kg H₂O
                                      1,000 grams

(Step 3)

Molality = moles solute / mass solvent (kg)

Molality = 0.245 moles NaCl / 0.0422 kg H₂O

Molality = 5.80 M

The correct reactant ratio for the reaction 2Fe + 3Cl2 → 2FeCl3 is 2 moles of iron (Fe) for every 3 moles of chlorine (Cl2).

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Answer:

The entropy of this reaction (ΔS) = -187.9 J/K

Explanation:

.Step : Data given

ΔS = -187.9 J/K

ΔH = -198.4 kJ

T = 297.0 K

Step 2: The balanced equation

2SO2(g) + O2(g) → 2SO3(g)

Step 3: Calculate the entropy

ΔG = ΔH - TΔS

⇒ΔG = the gibbs free energy

⇒ΔH = the change in enthalpy of the reaction = -198.4 kJ

⇒with T = the temperature = 297.0 K

⇒with ΔS = the change of entropy =  -187.9 J/K

ΔG = -198400 kJ -297*(-187.9kJ/mol)

ΔG = -198400+55806.3

ΔG = - 142593.7 kJ = the gibbs free energy

The entropy of this reaction (ΔS) = -187.9 J/K

Answer:

C. -187.9 J/K

Explanation:

Entropy is just ΔS, which it gives you in the question as -187.9 J/K.

Answer:

36

Explanation:

H - 1

O - 16

H2O = 2(1) + 16 = 18

2(H2O) = 36

Answer:

Synthetic polymers are made up of long chains of atoms, arranged in repeating units, often much longer than those found in nature. It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible. In other words, it's what makes them so plastic.

Explanation: i tried

Answer:

Moles of tin = 0.37 mol

Explanation:

Given data:

Mass of tin oxide = 50 g

Moles of tin = ?

Solution:

Number of moles of SnO:

Number of moles = mass/molar mass

Number of moles = 50 g/ 134.71 g/mol

Number of moles = 0.37 mol

We can see there is only one mole of Sn is present in one mole of tin oxide.

Thus in 0.37 mol  of tin oxide,

0.37 mol × 1 = 0.37 mol of tin

Answer:

The solution formed is acidic

pH = 0.87

Explanation:

The acid-base reaction of NaOH with HCl is:

NaOH + HCl → NaCl + H₂O

Where 1 mole of NaOH reacts with 1 mole of HCl

In the problem, moles of NaOH and HCl are:

NaOH: 0.0250L × (0.525mol / L) = 0.013125 moles NaOH

HCl: 0.0750 × (0.355mol / L) = 0.026625 moles HCl

As moles of HCl > moles NaOH, HCl is in excess and the solution formed is acidic

Moles in excess of HCl are:

0.026625 moles - 0.013125 moles = 0.0135 moles HCl

As the volume of the solutions is 25.0mL + 75.0mL = 100.0mL = 0.100L, molarity of HCl after reaction is:

0.0135 moles HCl / 0.100L = 0.135M HCl = 0.135M H⁺

As pH is defined as - log [H⁺], pH of the solution is:

pH = -log 0.135M H⁺ = 0.87

pH = 0.87

The pH of the resulting solution of the acid and base mixture is; Acidic with a PH = 0.87

We are given;

Volume of NaOH = 25 mL = 0.025 L

Volume of HCl = 75 mL = 0.075 L

Concentration of NaOH = 0.525 M

Concentration of HCl = 0.355 M

Total volume of solution = 0.025 + 0.075 = 0.1 L

Now, the the equation of the reaction is;

HCl + NaOH = NaCl + H2O

We can see that 1 mole of HCl reacts with 1 mole of NaOH.

Since; number of moles = Volume × concentration

Number of moles of HCl = 0.075 × 0.355

Number of moles of HCl = 0.026625 moles

Similarly;

Number of moles of NaOH = 0.025 × 0.525

Number of moles of NaOH = 0.013125 moles

We can see that the number of moles of HCl is greater than that of NaOH and as such there is excess HCl acid in the mix.

Thus,

Excess moles of HCl acid = 0.026625 - 0.013125

Excess moles of HCl acid = 0.0135 moles

Concentration of this excess HCl is gotten by the formula;

M = Excess moles/total volume

M = 0.0135/0.1

M = 0.135 M

PH of this excess concentration is;

PH = -log [H+]

PH = -log [0.135]

PH = 0.87

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Answer:

2

Explanation:

A

Answer: 4!!!

Explanation: j took the quiz!!!

Answer:

door

Explanation:

door I guess..................

the IV drip rate for administering Ringer's Lactate over 12 hours would be approximately 21 drops per minute (gtt/min).

To calculate the IV drip rate for administering Ringer's Lactate over 12 hours, we'll follow these steps:

Step 1: Determine the total number of drops required.

Step 2: Calculate the drip rate per minute.

Step 3: Convert the drip rate to drops per minute (gtt/min).

Let's begin:

Step 1: Determine the total number of drops required.

The order is to administer 1000 ml of Ringer's Lactate over 12 hours. Since we have 1 liter (1000 ml) of Ringer's Lactate available, the total number of drops required will be the same as the total volume in milliliters.

Total drops = 1000 ml

Step 2: Calculate the drip rate per minute.

To find the drip rate per minute, we'll divide the total number of drops by the duration in minutes.

12 hours = 12 * 60 = 720 minutes

Drip rate per minute = Total drops / Duration in minutes

Drip rate per minute = 1000 ml / 720 min

Step 3: Convert the drip rate to drops per minute (gtt/min).

Given that the infusion tubing is labeled 15 gtt per ml, we can use this information to convert the drip rate from milliliters per minute to drops per minute.

Drops per minute = Drip rate per minute * Infusion tubing label (gtt/ml)

Drops per minute = (1000 ml / 720 min) * 15 gtt/ml

Now we can calculate the solution:

Drops per minute = (1000 ml / 720 min) * 15 gtt/ml

Drops per minute ≈ 20.83 gtt/min

Rounding off to the nearest whole number:

Drops per minute ≈ 21 gtt/min

Therefore, the IV drip rate for administering Ringer's Lactate over 12 hours would be approximately 21 drops per minute (gtt/min).

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Axodendritic type of synapse that occurs between the terminal end of the presynaptic cell and the dendrites of the postsynaptic cell is referred to as which kind of synapse

Synapses are part of the circuits that connect the sensory organs of the peripheral nervous system to the brain. B. People who perceive pain and touch. Synapses connect neurons in the brain to neurons in the rest of the body, and from those neurons to muscles.

A synapse is a small gap between two neurons where nerve impulses are carried by neurotransmitters from the axon of a presynaptic (transmitting) neuron to the dendrites of a postsynaptic (receiving) neuron. It is called the synaptic cleft or synaptic cleft.

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Answer:

4

Explanation:

because use the molar ratio of

ca:h2o

1:2

2;4

so u times it by 2 .

hope this helps:)

To determine the number of grams of \(NH_3\) needed to react with 90.9 g of \(K_2PtCl_4\), we need to calculate the stoichiometric ratio between  \(NH_3\) and  \(K_2PtCl_4\), using their respective molar masses and the balanced chemical equation.

To solve this problem, we first need to write the balanced chemical equation for the reaction between  \(NH_3\) and  \(K_2PtCl_4\). The equation is as follows:

\(2NH_3\) +  \(K_2PtCl_4\)-> Pt(NH3)2Cl2 + 2KCl

From the balanced equation, we can see that 2 moles of  \(NH_3\) react with 1 mole of   \(K_2PtCl_4\).

Next, we calculate the molar mass of  \(NH_3\) and  \(K_2PtCl_4\). The molar mass of  \(NH_3\) is 17.03 g/mol (1 nitrogen atom + 3 hydrogen atoms), and the molar mass of  \(K_2PtCl_4\) is 415.24 g/mol (2 potassium atoms + 1 platinum atom + 4 chlorine atoms).

Now we can set up a proportion to find the number of moles of  \(NH_3\) required:

(2 moles  \(NH_3\) / 1 mole  \(K_2PtCl_4\)) = (x grams  \(NH_3\) / 90.9 grams  \(K_2PtCl_4\))

Cross-multiplying and solving for x, we get:

x = (2 moles  \(NH_3\) / 1 mole  \(K_2PtCl_4\)) × (90.9 grams  \(K_2PtCl_4\)/ 415.24 g/mol  \(K_2PtCl_4\)) × (17.03 g/mol  \(NH_3\) / 1 mole  \(NH_3\) )

Evaluating the expression, we find:

x ≈ 7.41 grams  \(NH_3\)

Therefore, approximately 7.41 grams of  \(NH_3\) are needed to react with 90.9 grams of  \(K_2PtCl_4\).

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