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
romanna [79]
3 years ago
7

Does anybody know the answer to these two questions ?

Chemistry
1 answer:
Serga [27]3 years ago
6 0
The first on is a and the second c I belive
You might be interested in
How many formula units of CaO are in 32.7 g of CaO?
max2010maxim [7]

Answer:

3.51× 10²³ formula units

Explanation:

Given data:

Mass of CaO = 32.7 g

Number of formula units = ?

Solution:

First of all we will calculate the number of moles.

Number of moles = mass/molar mass

Number of moles = 32.7 g/ 56.1 g/mol

Number of moles = 0.583 mol

Number of formula units:

1 mole = 6.022 × 10²³ formula units

0.583 mol ×  6.022 × 10²³ formula units / 1 mol

3.51× 10²³ formula units

The number 6.022 × 10²³ is called Avogadro number.

7 0
3 years ago
A piece of copper has a mass of 660 g. How many atoms does the sample contain?
son4ous [18]
The conversions that will be used are:

1 mole of copper / 63.5 grams of copper
6.02 x 10²³ atoms of copper / 1 mole of copper

Multiplying the given mass by these conversions,

660 g * (1 mol Cu / 63.5 g Cu) * (6.02 x 10²³ Cu atoms / 1 mole Cu)

The sample contains 6.25 x 10²⁴ atoms of copper
4 0
3 years ago
Suppose you wanted to make 100 grams of water. A. What is the molar mass of water (H2O)? B. How many moles of water are in 100 g
Gemiola [76]
I need to answer more
4 0
3 years ago
Read 2 more answers
Which of the following changes will always be true for a spontaneous reaction? (3 points)
Alika [10]
Answer is: <span>- delta G.
</span>The change in Gibbs free energy (ΔG), at constant temperature and pressure, is: <span>ΔG=ΔH−TΔS.
</span>ΔH<span> is the change in enthalpy.
</span>ΔS is change in entropy.
T is temperature of the system.
When ΔG is negative, a reaction (<span>occurs without the addition of external energy)</span><span> will be spontaneous (</span>exergonic).

3 0
3 years ago
A student makes the following hypothesis: If the amount of chocolate increases then the cake will taste sweeter. What is the ind
Talja [164]

Answer:

the chocolate

Explanation:

You are changing the amount of chocolate

8 0
3 years ago
Other questions:
  • Which has greater precision, the 10 ml graduated cylinder or the 50 ml graduated cylinder?
    15·1 answer
  • Write the steps to separate the <br>Water from salt solution​
    5·2 answers
  • Express the following number using scientific notation 5,610,000??
    10·1 answer
  • 12. Penny can knit 4 rows of a sweater in 5
    5·1 answer
  • A class of substances known as __________ are used for their medicinal properties.
    9·2 answers
  • In which direction are groups on the periodic table? →, ↓, ​↘​ In which direction are periods on the periodic table?
    7·2 answers
  • What class of chemicals is responsible for ozone depletion?
    7·1 answer
  • HELP ME PLEASE!! IAM BEING TIMED.<br> I WILL GIVE YOU BRAINLIEST!
    11·2 answers
  • contrast copy and fill in this graphic organizer to contrast how different elements, isotopes, and ions are produced
    7·1 answer
  • Highly permeable soil that is capable of storing water is called a(n)___________.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!