What is the mass of 2.15 liters of N2 gas at STP?

Answer:

60g/mol.

Explanation:

TO FIND :-

FACTS TO KNOW BEFORE FINDING ANSWER :-

SOLUTION :-

Molar mass of C₃H₈O = 3(Molar mass of C) + 8(Molar mass of H) + 1(Molar mass of O)

⇒ Molar mass of C₃H₈O = (3×12) + (8×1) + 16 = 36 + 8 + 16 = 60g/mol.

Answer:

3)alpha decay because alpha particles have two protons and two neutrons

Explanation:

When a radioactive isotope undergoes a decay, a daughter nucleus or nuclei is/are formed. The mass number and atomic number of the daughter nucleus gives us an idea of the nature of radioactive decay that the parent nucleus underwent.

If the daughter mass number of the daughter nucleus is four units less than that of the parent nucleus and the atomic  number of the daughter nucleus is two units less than that of the parent, then such a decay is an alpha decay.

An alpha particle has two protons and two neutrons thus it has a mass number of 4 and an atomic number of two.

Answer:

x is HCl because pH = 2 (acid and it reacted with Mg plus it turned litmus paper to red)

y is NaOH because pH = 10 (base and turned litmus paper to blue)

z is NaCl because pH = 7 (neutral and no reaction to litmus paper and Mg)

Answer:

NOAA and FWS are required by law to compare background rates to current rates.

Explanation:

Answer:

If current rates greatly exceed background rates, scientists say there is a chance of a mass extinction event happening.

Explanation:

Scientists compare current rates of extinction to the background rate to see if there is a potential problem developing.

I got it right on the quiz.

Answer:

9 moles of Sulphur will react with 6moles of Aluminum

Hydroelectric energy is produced.

Answer:

From Pressure Law

P1/T1 = P2/T2

Changing our temp to kelvin

T1 = 47 +273 = 320K

We're looking for T2

Making T2 the subject

T2 =P2 x T1 / P1

= 655 x 320/850

T2 = 246K

To balance Ca + Cl2 = CaCl2 you'll need to be sure to count all of atoms on each side of the chemical equation.

Once you know how many of each type of atom you can only change the coefficients (the numbers in front of atoms or compounds) to balance the equation for Calcium + Chlorine gas.

Answer:

A

Explanation:

Rock sand sun arent living.  cactus lizard sam and snake are living or biotic

Answer:

The speed of a wave is how far the wave travels in one unit of time. (eg: seconds)

Explanation:

For instance, if the crest of a wave travels 30 meters in 2 seconds, the speed of that wave is 15 m/s.

Answer:

1..... nucleus

2......electron cloud

3.......protons

4........Neutrons

5..........electron

6............electrons

7...............Isotopes

8.....,...........ions

9....................charge

Answer:

78° C.

Explanation:

The final temperature of water is 81℃ , if it is allowed to cool from a temperature of 95  and  it releases heat of 1200J.

In the following question we will apply specific heat Capacity equation

q=mct Δt

q= 1200J   m= 20 g c= 4.186  T₁= 95 ℃

1200= 20 ✕4.186(95-T₂)

T₂=81℃

Hence, The water cools to 81℃ temperature

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Answer:

2NaCl = 2Na + 2Cl

Explanation:

Sodium chloride decomposes to form sodium and chlorine

Answer:

the relationship between mass and volume

Answer:

Periodic Table

hope this helps

have a good day :)

Explanation:

The periodic table allows you to compare the elements and understand their properties​.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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Answer:

1.6 M/min

Explanation:

Step 1: Given data

Step 2: Convert "t" to min

We will use the conversion factor 1 min = 60 s.

15 s × 1 min/60 s = 0.25 min

Step 3: Calculate the reaction rate

We will use the following expression.

r = -ΔC/t

r = -(0.6 M - 1 M)/0.25 min = 1.6 M/min

Answer:reflection

Explanation:

Answer:

1.5 moles of KMnO4 will be produced from 1.5 moles of MnO2

Explanation:

The balanced equation of this chemical reaction is

2 MnO2 + 4 KOH + O2 → 2 KMnO4 + 2 KOH + H2

2 moles of MnO2 produces 2 moles of   KMnO4

That means 1 moles of KMnO4 will be produced from 1 moles of MnO2

Hence, 1.5 moles of KMnO4 will be produced from 1.5 moles of MnO2

The moles of manganese oxide were used in the reaction is 1.5 moles.

Stoichiometry of any reaction tells about the relative amount of species present before and after the chemical reaction.

Given chemical reaction is:

2MnO₂ + 4KOH + O₂ → 2KMnO₄ + 2KOH + H₂

From the stoichiometry of the reaction, it is clear that same moles of manganese oxide and potassium permanganate is involved in the reaction.

2 moles of KMnO₄ = produce by 2 moles of MnO₂

1.5 moles of KMnO₄ = produce by 2/2×1.5=1.5 moles of MnO₂

Hence, required moles are 1.5 moles.

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Answer:

if it is espresso(1 shot), the coffee content to be considered is: (77/44)*(10/3)= 5.833= 0.005833 grams

Explanation:

Explanation:

Reactant concentration.

Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.

Answer:

Approximately [tex]2.46\; \rm mol[/tex].

Explanation:

Make use of the molar mass data ([tex]M({\rm C_2H_2}) = 26.04\; \rm g \cdot mol^{-1}[/tex]) to calculate the number of moles of molecules in that [tex]64.0\; \rm g[/tex] of [tex]\rm C_2H_2[/tex]:

[tex]\begin{aligned}n({\rm C_2H_2}) &= \frac{m({\rm C_2H_2})}{M} \\ &= \frac{64.0\; \rm g}{26.04\; \rm g\cdot mol^{-1}}\approx 2.46\; \rm mol\end{aligned}[/tex].

Make sure that the equation for this reaction is balanced.

Coefficient of [tex]\rm C_2H_2[/tex] in this equation: [tex]2[/tex].

Coefficient of [tex]\rm H_2O[/tex] in this equation: [tex]2[/tex].

In other words, for every two moles of [tex]\rm C_2H_2[/tex] that this reaction consumes, two moles of [tex]\rm H_2O[/tex] would be produced.

Equivalently, for every mole of [tex]\rm C_2H_2[/tex] that this reaction consumes, one mole of [tex]\rm H_2O[/tex] would be produced.

Hence the ratio: [tex]\displaystyle \frac{n({\rm H_2O})}{n({\rm C_2H_2})} = \frac{2}{2} = 1[/tex].

Apply this ratio to find the number of moles of [tex]\rm H_2O[/tex] that this reaction would have produced:

[tex]\begin{aligned}n({\rm H_2O}) &= n({\rm C_2H_2}) \cdot \frac{n({\rm H_2O})}{n({\rm C_2H_2})} \\ &\approx 2.46\; \rm mol \times 1 = 2.46\; \rm mol\end{aligned}[/tex].

Answer:

Half-life = 2.7 days

Explanation:

The radioactive decay of an isotope follows the equation:

Ln[A] = -kt + ln[A]₀

Where [A] could be taken as the amount of A after t time, k is decay constant, [A]₀ initial amount of A.

Replacing to solve k:

Ln[3.125g] = -k*13.5days + ln[100g]

-3.465736 = -k*13.5days

k = 0.2567days⁻¹

Half-life is:

half-life = ln2 / k

Answer:

a0.0075 mi i think so ok but average is need to add and divide

Answer:

[tex]V_1=82.6mL[/tex]

Explanation:

Hello there!

In this case, according to this question, we will need to deal with this dilution problem, because it is asking for the volume of a 12.1-M stock solution of HCl. In such a way, we can use the following equation, under the assumption of no change in the number of moles in the solution:

[tex]M_2V_2=M_1V_1[/tex]

Thus, we solve for the initial volume, V1, as shown below:

[tex]V_1=\frac{M_2V_2}{M_1}[/tex]

And plug in the initial concentration and final concentration and volume to obtain:

[tex]V_1=\frac{2000mL*0.500M}{12.1M}\\\\V_1=82.6mL[/tex]

Regards!

Answer:

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Explanation:

Explanation:

Beryllium has the highest Ionization energy