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
tigry1 [53]
3 years ago
8

How many atoms are in .800 g of Ca

Chemistry
2 answers:
Goshia [24]3 years ago
8 0
The answer for this question is 0.8
lesya692 [45]3 years ago
8 0
0.8 atoms are in .800 g of Ca
You might be interested in
A tank contains 90 kg of salt and 2000 L of water. Pure water enters a tank at the rate 6 L/min. The solution is mixed and drain
sashaice [31]

Answer:

a) 90 kg

b) 68.4 kg

c) 0 kg/L

Explanation:

Mass balance:

-w=\frac{dm}{dt}

w is the mass flow

m is the mass of salt

-v*C=\frac{dm}{dt}

v is the volume flow

C is the concentration

C=\frac{m}{V+(6-3)*L/min*t}

-v*\frac{m}{V+(6-3)*L/min*t}=\frac{dm}{dt}

-3*L/min*\frac{m}{2000L+(3)*L/min*t}=\frac{dm}{dt}

-3*L/min*\frac{dt}{2000L+(3)*L/min*t}=\frac{dm}{m}

-3*L/min*\int_{0}^{t}\frac{dt}{2000L+(3)*L/min*t}=\int_{90kg}^{m}\frac{dm}{m}

-[ln(2000L+3*L/min*t)-ln(2000L)]=ln(m)-ln(90kg)

-ln[(2000L+3*L/min*t)/2000L]=ln(m/90kg)

m=90kg*[2000L/(2000L+3*L/min*t)]

a) Initially: t=0

m=90kg*[2000L/(2000L+3*L/min*0)]=90kg

b) t=210 min (3.5 hr)

m=90kg*[2000L/(2000L+3*L/min*210min)]=68.4kg

c) If time trends to infinity the  division trends to 0 and, therefore, m trends to 0. So, the concentration at infinit time is 0 kg/L.

6 0
3 years ago
PLEASE HELP ME THIS IS DUE RN I HAVE NO IDEA I WILL MARK BRAINLIEST I JUST NEED HELP
djverab [1.8K]

Answer:

3.45 × 10^5

=3.45^5

I hope this helps

6 0
3 years ago
How many moles of mercury, Hg, are there in 1.30 x 10^7 atoms of murcury? PLEASE HELP, IT'S URGENT! Thank you! (:
vodka [1.7K]
1 mole Hg ---------------- 6.02x10²³ atoms
??  ------------------------- 1.30 x10⁷ atoms

1.30x10⁷ x 1 / 6.02x10²³ =

= 1.30x10⁷ / 6.02x10²³ => 2.159x10⁻¹⁷ moles

hope this helps!

7 0
3 years ago
Which component is required for the activation of some enzymes?
shepuryov [24]
The best answer is letter A. 
The main factors that change the speed of enzymatic reactions are temperature, pH and substrate concentration (quantity). <span>There are enzymes that need other associated molecules to work. These molecules are called enzyme co-factors. They can be organic ions like mineral salts.</span>
5 0
3 years ago
Read 2 more answers
What is an example of chemical change
Helga [31]
 metal rusting in salt water
4 0
3 years ago
Read 2 more answers
Other questions:
  • How many molecules of water are in a 500.0 grams water bottle?​
    7·1 answer
  • Marcus measured the masses and volumes of samples of four different substances, and he calculated their densities. The table sho
    13·1 answer
  • What is the formula for ammonium carbonite? How did you get it?
    10·2 answers
  • . A ________________ is formed when two or more ______electrons____ bond by a covalent bond.
    13·1 answer
  • Ray puts a glass of ice water on the table. One hour later he observes that only water is left in the glass. What happened?
    7·2 answers
  • Which of the following could be considered a scientific statement
    15·2 answers
  • If you were asked to convert 25 cg to the unit hg, which of the following would be the first fraction used in the conversion? on
    14·1 answer
  • A scientist has found a new drug that appears to provide weight loss in humans without dieting. The scientist has tested the dru
    8·1 answer
  • Electron configuration
    10·1 answer
  • How many total moles of ions are released when 0.0341 moles of Na2HPO4 dissolves completely in water
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!