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
krok68 [10]
3 years ago
11

What is the density of an object that has a mass of 21 g and a volume of 9 ml?

Chemistry
1 answer:
mylen [45]3 years ago
5 0

The formula is density = mass / Volume

density = ?

mass = 21 g

Volume = 9 mL

d = m / V

d = 21 g / 9 mL

d = 2.3 g/mL

Hope this help!


You might be interested in
if the reduced row echelon form of the augmented matrix for a linear system has a row of zeros, then the system must have infini
BigorU [14]

Answer:

False

Explanation:

If the row echelon form of the augmented matrix for a linear system has a row of zeros, then the there must not have infinitely many solution,

we can prove this with an example. Suppose we have an augmented matrix A for linear system with a row of zeros,

             1     0      0      1

A=         0     1       0    -2

            0     0       1    - 1

            0    0       0     0

we get

x1=1

x2=-2

x3=-1

so, system has an unique solution.

we can take inference that the given statement is wrong

7 0
3 years ago
If 20 grams of N2 react completely with H2 , how many moles of NH3 are produced? Show Work
Maslowich
This is the balanced eq
N2 + 3H2 -> 2NH3
first you need to find mole of N2 by using
mol = mass ÷ molar mass.
mol N2= 20g ÷ (14.01×2)g/mol
=0.7138mol
then look at the coefficient between H2 and NH3.
it is N2:NH3
1:2
0.7138:0.7138×2
0.7138:1.4276 moles
moles of NH3 = 1.4276 moles
5 0
3 years ago
explain how both hydrogen and carbon have achieved stability by bonding with each other to form methane ​
Naya [18.7K]

A carbon iota can bond with four other iotas and is just like the four-hole wheel, whereas an oxygen iota, which can bond only to two, is just like the two-hole wheel.

4 0
2 years ago
Read 2 more answers
A ______ must be replaced after too much current in it causes it to melt.
Nezavi [6.7K]
A circuit breaker must be replaced after too much current flowing through it causing it to melt.
6 0
3 years ago
I need help with this question please asap I would really appreciate it
yanalaym [24]

Answer:

I think c

Explanation:

4 0
3 years ago
Other questions:
  • How many grams of zinc are needed to produce 25.0 g ZnCl2
    5·1 answer
  • Solid sodium reacts with liquid water to form hydrogen gas according to the equation 2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g) Wha
    15·1 answer
  • Consider these reactions, where M represents a generic metal.
    10·1 answer
  • Reasons why convection is responsible for the uneven heating of the air in the atmosphere
    6·1 answer
  • Which compound, feco3 or pbbr2 is more soluble in acid than in base? why?
    13·2 answers
  • Barium and lead both produce yellow precipitate with the chromate ion as part of their confirmation tests. if you had a sample t
    8·2 answers
  • Something used to power some devices.
    8·1 answer
  • If a response is towards a stimulus it's described as _______; if a response is away from the stimulus it's described as _____.
    6·1 answer
  • After mg ribbon is reacted completely with air, what is the reason to add some water and heat?
    14·1 answer
  • What volume of a 0.252 M hydroiodic acid solution is required to neutralize 18.0 mL of a 0.151 M barium hydroxide solution
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!