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
aleksklad [387]
3 years ago
8

Whats the answer? please help me​

Chemistry
1 answer:
dybincka [34]3 years ago
8 0
Answer C
I could be wrong
Explanation
You might be interested in
5. A penny weighs about 2.5 g. How many moles of pennies would be required to equal the mass of the moon (7.3x10^24 kg)
schepotkina [342]

5. 1.16 x 10^{26} moles  moles of pennies would be required to equal the mass of the moon.

6. 12.86 moles of ethanol are in a 750 ml bottle of vodka.

Explanation:

5 .Data given:

mass of penny = 2.5 grams

atomic mass of penny = 62.93 grams/mole

moles present in mass of the moon given as = 7.3 x 10^{24} kg

number of moles = \frac{mass}{atomic mass of  1 mole}

number of moles = \frac{2.5}{62.93}

0.039 moles of penny is present in 2.5 grams

0.039 moles of penny in 2.5 grams of it

so, x moles in 7.3 X 10^{27}  grams

\frac{0.039}{2.5} =\frac{x}{7.3 X 10^{27} }

x = 1.16 x 10^{26} moles

so when the mass of the penny given is equal to the mass of moon, number of moles of penny present is 1.1 x 10^{26} .

6.

Given:

vodka = 40% ethanol

volume of vodka bottle = 750 ml

moles of ethanol =?

density of ethanol =0.79 g/ml

atomic mass of ethanol = 46.07 grams/mole

so, from the density of ethanol given we can calculate how much ethanol is present in the solution.

density = \frac{mass}{volume}

density x volume = mass

0.79 x 750 = 592.5 grams

number of moles = \frac{mass}{atomic mass of 1 mole}

number of moles of ethanol = \frac{592.5}{46.07}

                                               = 12.86 moles of ethanol

6 0
3 years ago
A sample of gas has a volume of 4.4 liters when the pressure is 3.3 atm. What is the volume when the pressure is reduced to 2.2
murzikaleks [220]
6.6 liters would be your answer. 
5 0
3 years ago
Read 2 more answers
A negative △H means an exothermic reaction.<br><br> True<br> False
Nostrana [21]
Your answer is False I think
6 0
3 years ago
Why do atoms bond????????
Doss [256]
<span> In order to create a complete full outer shell of electrons.
</span><span /><span>
</span>
4 0
3 years ago
Read 2 more answers
When HBr combines with water, it produces H3O+ and Br- ions. This shows that HBr is a base. true false
ELEN [110]
HBr is a strong acid

False
6 0
3 years ago
Read 2 more answers
Other questions:
  • Which is not a sign of a physical change? *
    10·1 answer
  • Consider a sample of 11.2 g of ice initially at 0.0 C. How much energy in kilojoules is required to melt the ice and warm it to
    12·1 answer
  • Complete the balancing of this equation ; which shows the reaction between iron and carbon :
    13·1 answer
  • Corrosion is what type of chemical change?
    14·1 answer
  • HClO4 acid solution has a concentration of 5 Molarity. Calculate the concentration of this solution in
    13·1 answer
  • sodium reacts with chlorine gas to form sodium chloride. if you have 60 L of chlorine gas at STP and 30 g of sodium, how many gr
    9·1 answer
  • Which products would form if chlorine gas was bubbled through a solution of sodium bromide?
    10·2 answers
  • Which of the below elements are part of a group? Feel free to use the periodic table.
    8·2 answers
  • How many moles of gas are in a 30 liter compressed air tank if the
    15·2 answers
  • When carbon dioxide dissolves in water, it undergoes a multistep equilibrium process, with Koverall = 4.5x10⁻⁷, which is simplif
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!