1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
balu736 [363]
3 years ago
7

The number of protons + number of neutrons is equal to the

Chemistry
1 answer:
max2010maxim [7]3 years ago
5 0

Answer: mass

Explanation: the protons and neutrons make up the nucleus and nearly the entire mass of the atom

You might be interested in
What is the purpose of cell respiration? to breath in food to expel unwanted oxygen to produce energy from food]
zysi [14]

Answer:

cellular respiration is a critical function by which cells release energy for various cellular activities like locomotion, biosynthesis, and even the transportation of molecules between membranes.

3 0
3 years ago
Urea (CH₄N₂O) is a common fertilizer that can be synthesized by the reaction of ammonia (NH₃) with carbon dioxide as follows:
ankoles [38]

Answer:

The answer to your question is:  68.3%

Explanation:

Urea = ?

Theoretical yield

Ammonia 145.1 kg

Carbon dioxide = 211.4 kg

Urea = 174.9 kg

MW NH3 = 17kg

MW CO2 44 kg

MW Urea = 60 kg

                     2NH₃(aq)     +    CO₂(aq)    →     CH₄N₂O(aq)    +     H₂O(l)

                     34                        44 kg                 60kg

                    145.1                   211.4                   174.9

Limiting reactant = NH3

                   34kg of NH3 ------------------ 60 kg of Urea

                    145.1 kg       -------------------   x

                 x = (145.1 x 60) / 34

                x = 256 kg of Urea

Percent yield = 174.9 / 256 x 100

                     = 68.3%

 

7 0
3 years ago
PLZZZZ<br> HELP<br> MEH<br> THANKS<br> YEET
aleksandrvk [35]

Remark

The question with these kind of problems is "Which R do you use?" That's where dimensional analysis is so handy. You must look at the units of the givens and choose your R accordingly. You'll see how that works in a moment.

You need to list the givens along with their units and in this case the property you want to solve for. You need all that to determine the R value

Givens

n = 0.25 moles

T = 35°C = 35 + 273.15 = 308.15°K

V = 6.23 L

Pressure = P in kPa

Which R

The units of the R you want has to have units of moles, kPa, °K and liters

The R that  you want is 8.314

<em><u>Formula</u></em>

PV = nRT

P 6.23 = 0.25 * 8.314 * 308.15  Combine the left

P*6.23 = 640.5

P = 640.5/6.23 = 102.81  The answer should be 100 kpA of 1.0 * 10^2 kPa

because the number of moles has only 2 sig digs.

But if sig digs are not a problem 102.8 is likely close enough.

Second Question

You are going to have to clean up the numbers. I think I've got only 1 chance at this. The partial pressures of the 2 gases will add up to the total pressure. So the total pressure was 100 approx and the water vapor was 3.36 kPa. The difference is

Total = air + water vapor

100.18 = air + 3.36 about  Subtract 3.36 from both sides.

100.18 - 3.36 = 96.82 about. Pick the answer that is closest to that. I'll clean up the numbers if I can.

Answer  C

6 0
3 years ago
Read 2 more answers
A student made a graph to show the chemical equilibrium position of a reaction. The student forgot to label the y-axis of the gr
Arturiano [62]
You have to get the x said
3 0
2 years ago
Read 2 more answers
Hydrazine, N2H4 , reacts with oxygen to form nitrogen gas and water. N2H4(aq)+O2(g)⟶N2(g)+2H2O(l) If 2.65 g of N2H4 reacts with
White raven [17]

<u>Answer:</u> The percent yield of the reaction is 17.41 %.

<u>Explanation:</u>

  • <u>For N_2H_4</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}  

Given mass of N_2H_4 = 2.65 g

Molar mass of N_2H_4 = 32.04 g/mol

Putting values in above equation, we get:

\text{Moles of }N_2H_4=\frac{2.65g}{32.04g/mol}=0.0827mol

  • <u>For N_2</u>

To calculate the number of moles, we use the equation given by ideal gas equation:

PV=nRT

where,

P = pressure of the gas = 1 atm

V = Volume of gas = 0.350 L

n = Number of moles = ?

R = Gas constant = 0.0820\text{ L atm }mol^{-1}K^{-1}

T = temperature of the gas = 273 K

Putting values in above equation, we get:

1.00atm\times 0.350L=n\times 0.0820\text{ L atm }mol^{-1}K^{-1}\times 295K\\\\n=0.0144mol

Now, to calculate the experimental yield of N_2, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}   .....(1)

We are given:

Moles of nitrogen gas = 0.0144 moles

Molar mass of nitrogen gas = 28 g/mol

Putting values in above equation, we get:

0.0144mol=\frac{\text{Mass of nitrogen gas}}{28g/mol}\\\\\text{Mass of nitrogen gas}=0.4032g

Experimental yield of nitrogen gas = 0.4032 g

  • For the given chemical equation:

N_2H_4(aq.)+O_2(g)\rightarrow N_2(g)+2H_2O(l)

By Stoichiometry of the reaction:

1 mole of N_2H_4 produces 1 mole of nitrogen gas.

So, 0.0827 moles of N_2H_4 will produce = \frac{1}{1}\times 0.0827=0.0827mol of nitrogen gas.

Now, to calculate the theoretical yield of nitrogen gas, we use equation 1:

Moles of nitrogen gas = 0.0827 mol

Molar mass  nitrogen gas = 28 g/mol

Putting values in above equation, we get:

0.0827mol=\frac{\text{Mass of nitrogen gas}}{28g/mol}\\\\\text{Mass of nitrogen gas}=2.3156g

Theoretical yield of nitrogen gas = 2.3156 g

  • To calculate the percentage yield of nitrogen gas, we use the equation:

\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100

Experimental yield of nitrogen gas = 0.4032 g

Theoretical yield of nitrogen gas = 2.3156 g

Putting values in above equation, we get:

\%\text{ yield of nitrogen gas}=\frac{0.4032g}{2.3156g}\times 100\\\\\% \text{yield of nitrogen gas}=17.41\%

Hence, the percent yield of the reaction is 17.41 %.

8 0
3 years ago
Other questions:
  • Which substance has a chemical symbol that is derived from a Latin name?  
    12·2 answers
  • What is a fuel produced by fermenting crops.
    15·1 answer
  • Chemistry an atom of strontium has at least four different isotopes. what is different between an isotope of 86sr and an isotope
    12·1 answer
  • Please help me with this question it's due in like 3hours from now
    10·1 answer
  • A _______ is a segment of DNA that contains the information necessary to express the inherited traits of an organism. A. protein
    8·1 answer
  • How many liters of air must react with 2500 mL of hexane in order for combustion to occur completely. The percentage of oxygen i
    13·1 answer
  • Human reaction time is usually about 0.18 s. If your lab partner holds a ruler between your finger and thumb and releases it fro
    14·1 answer
  • Which is the electron configuration for bromine?
    10·1 answer
  • Describe a method to investigate the effect
    8·1 answer
  • PLEASE HELP!!!!! THIS MUY HARD
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!