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
Arturiano [62]
3 years ago
12

If 81g of water is measured out, how many moles are in the sample? *

Chemistry
1 answer:
valkas [14]3 years ago
7 0

Answer:

D

Explanation:

because moles = mass /mr

so 81/18(mr of H2O=2+16)

moles =4.5

hope this helps:)

You might be interested in
How many grams of H2O are needed to produce 150 g of Mg(OH)2? (Molar mass: H2O = 18.02 g/mol; Mg(OH)2 = 58.33 g/mol )
Nuetrik [128]

Answer:

92.6

Explanation:

6 mol x 18.02 g of H2o --> 3 mol x 58.33 g  Mg(OH)2

108.12 g of h2o --> 174.99 of Mg(OH)2

g of H2O is 150 g of Mg(OH)2

150g x 108.12g / 174.99 =

92.67

7 0
3 years ago
How many protons z and how many neutrons n are there in a nucleus of the most common isotope of silicon, 2814si?
zheka24 [161]
The 28 is the sum of the protons and neutrons in the element silicon.
ALL silicon atoms have 14 protons in the nucleus, so we can turn this into an equation:
#protons + #neutrons = 28
14 + #neutrons = 28
#neutrons = 14
#protons = 14
7 0
3 years ago
Read 2 more answers
Socratic an example of an atom that has no charge is one that has
aksik [14]

An example of an atom that has no charge is one that has a. 2 protons, 2 electrons, and 1 neutron.

To be neutral an atom must have the <em>same number</em> of protons (+) and electrons (-).

Only then will the <em>charges cancel</em> and give a neutral atom.


5 0
3 years ago
Which principal energy level of an atom contains an electron with the lowest energy?
Ad libitum [116K]
The answer is a.n=1 because it makes sence
4 0
3 years ago
Read 2 more answers
Gravitational force acts on two objects with which of the following?
ikadub [295]
The correct answer is A.

Gravitational force will attract any object with mass. It's why you're not floating in the air right now, but rather making contact with the ground. At the same time, since you have mass, you're also attracting other objects right now with gravitational force.
5 0
3 years ago
Read 2 more answers
Other questions:
  • In this experiment you will measure the stretching frequencies of different functional groups in a series of organic molecules.
    13·1 answer
  • What is the chemical formula for a disaccharide?
    5·1 answer
  • Which of the following statements regarding glucose is FALSE?a) Glucose is the main component of starch and glycogen.b) Glucose
    7·1 answer
  • __________ have an electric charge of -1.60 × 10-19 C (-e).
    10·1 answer
  • Write the formula for calcium chloride​
    15·1 answer
  • An adiabatic Turbine has R-134a as the working fluid. The inlet has a pressure of 200 kPa and a temperature of 20°C while the ou
    9·1 answer
  • Explain how you would decide which represents a greater mass: 3.25 x 1022 atoms of Ca or 2.45 grams of Mg?
    6·1 answer
  • Which one of the following substances is a liquid fuel used in rocket engines?
    13·2 answers
  • How do i find find moles for dilution useing the molarity formula??
    10·1 answer
  • Applying the rules of significant figures, which of the following would be the correct value for the density of a substance whic
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!