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
Rus_ich [418]
2 years ago
12

I need help this is 7th grade science

Chemistry
1 answer:
GREYUIT [131]2 years ago
8 0

Answer:

i need to know the question then i can help :)

Explanation:

You might be interested in
1. Calculate how many moles of glycine are in a 130.0-g sample of glycine.2. Calculate the percent nitrogen by mass in glycine.
Alexxx [7]

Answer:

n=1.732mol

\% N=18.7\%

Explanation:

Hello!

In this case, since the molecular formula of glycine is C₂H₅NO₂, we realize that the molar mass is 75.07 g/mol; thus, the moles in 130.0 g of glycine are:

n=130.0g*\frac{1mol}{75.07 g}\\\\ n=1.732mol

Furthermore, we can notice 75.07 grams of glycine contains 14.01 grams of nitrogen; thus, the percent nitrogen turns out:

\% N=\frac{14.01}{75.07}*100\% \\\\\% N=18.7\%

Best regards!

4 0
3 years ago
Cuales son las fórmulas de la velocidad
AnnZ [28]

Answer:

s = d÷ t

Explanation:

Where s means speed, d means distance and t means time

7 0
2 years ago
A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68
FinnZ [79.3K]

First of all, as you seen the gases are noble which means that will not react with each other and in this case each gas create individual pressure.  

P_{T}= total pressure  

P_{Ne} = pressure of neon  

P_{Ar} = pressure of argon  

P_{He} = pressure of helium {which is required}

P_{T} = P_{Ne} + P_{Ar} + P_{He}    

1.25 = 0.68 + 0.35 +  P_{He}

P_{He}   = 1.25  - [0.68 + 0.35] = 0.22 atm

4 0
3 years ago
PLEASE HELP ME ON THIS QUESTION
Brilliant_brown [7]
He call me big purr
4 0
3 years ago
T
svet-max [94.6K]

Explanation:

(1) The nucleus is positive and the electron cloud is positive.

(2) The nucleus is positive and the electron cloud is negative.

(3) The nucleus is negative and the electron cloud is positive.

(4) The nucleus is negative and the electron cloud is negative

4 0
3 years ago
Other questions:
  • Enter a balanced equation for the reaction of Na2S and CdSO4.
    6·2 answers
  • Decide which element probably forms a compound with oxygen that has a chemical formula most and least similar to the chemical fo
    11·1 answer
  • Describe the motion of a pendulum in terms of kinetic and potential energy. As the pendulum moves from its greatest to lowest he
    14·1 answer
  • Which individual elements make up the
    9·1 answer
  • What is the abreviation for carbon dioxide??
    13·1 answer
  • Explain why all glassware must be dry and the solvent anhydrous during formation and reaction of a grignard reaction. Further, e
    10·1 answer
  • How many Hydrogen (H) Atoms are in Methylene?​
    8·2 answers
  • I need help with both parts, ill give brainliest and 30 points
    15·2 answers
  • Definition of gravity
    6·1 answer
  • How many grams are in 0.220 mol of Ne?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!