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
viva [34]
3 years ago
10

How many moles are in 45.8 g of calcium nitrate, Ca(NO3),?

Chemistry
1 answer:
Deffense [45]3 years ago
4 0

Answer:

the number of moles is 0.279

Explanation:

The calculation of the number of moles of calcium nitrate, is given  below;

As We know that

Number of moles = mass of substance ÷ molecular weight

where

Mass of substance is 45.8g

And, the molecular weight is 164.088

so,

= 45.8 g ÷ 164.088

= 0.279moles

Thus , the number of moles is 0.279

We simply used the above formula so that the accurate value could arrive

You might be interested in
What does biodiversity mean?
kobusy [5.1K]

Answer:

Having as wide a range of organisms as possible.

Hope it helps! :)

7 0
3 years ago
Read 2 more answers
Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 79.0
Bas_tet [7]

<u>Answer:</u> The molality and molarity of zinc in the solution is 4.07 m and 28.11 M respectively.

<u>Explanation:</u>

Solute is the substance which is present in smaller proportion in a mixture and solvent is the substance which is present in larger proportion in a mixture.

We are given:

(m/m) % of Cu = 79 %

This means that 79 g of copper is present in 100 grams of alloy.

(m/m) % of Zn = 21 %

This means that 21 g of zinc is present in 100 grams of alloy.

As, zinc is present in smaller proportion. So, it is solute and copper is the solvent.

  • <u>Calculating molality of zinc:</u>

To calculate molality of the zinc, we use the equation:

Molality=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ in grams}}

where,

m_{solute} = Given mass of solute (Zinc ) = 21 g

M_{solute} = Molar mass of solute (Zinc) = 65.3 g/mol

W_{solvent} = Mass of solvent (copper) = 79 g

Putting values in above equation, we get:

\text{Molality of Zinc}=\frac{21\times 1000}{65.3\times 79}\\\\\text{Molality of zinc}=4.07m

  • <u>Calculating molarity of zinc:</u>

To calculate volume of a substance, we use the equation:

\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}

Density of solution = 8740kg/m^3=\frac{8740kg\frac{1000g}{1kg}}{1m^3\times \frac{10^6cm^3}{1m^3}}=\frac{8740g}{1000cm^3}=8.740g/cm^3

(Conversion factors used are:  1 kg = 1000 g &  1m^3=10^6cm^3  )

Mass of solution = 100 g

Putting values in above equation, we get:

8.740g/cm^3=\frac{100.0g}{\text{Volume of zinc}}\\\\\text{Volume of zinc}=11.44cm^3

To calculate the molarity of solution, we use the equation:

\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}

We are given:

Molar mass of zinc = 65.3 g/mol

Volume of solution = 11.44cm^3=11.44mL     (Conversion factor:  1cm^3=1mL  )

Mass of zinc = 21.0 g

Putting values in above equation, we get:

\text{Molarity of zinc}=\frac{21\times 1000}{65.3\times 11.44}=28.11M

Hence, the molality and molarity of zinc in the solution is 4.07 m and 28.11 M respectively.

4 0
3 years ago
*pls hurry, will give brainlyest or whatever!!*
brilliants [131]

Answer:

all of the above. they all are chemical reactions

4 0
3 years ago
A sample of SO2 gas at 0.821 atm occupies 4.24 L at 35°C, Calculate the new volume of the gas if the pressure is increased to 1.
Marysya12 [62]
Use the P1V1/T1=P2V2/T2 formula
4 0
3 years ago
A beta particle may be spontaneously emitted from
denpristay [2]
Unstable nucleus is your answer
3 0
3 years ago
Other questions:
  • ) A concentration cell is based on the aqueous reaction
    6·1 answer
  • If 5.3g O2 reacts with NH3 to produce 3.1g NO2, what would the percent yield of NO2 be?. . 4NH3(g) + 7O2(g) --&gt; 4NO2 + 6H2O(g
    14·2 answers
  • What is true about water that is freezing?
    5·2 answers
  • How is chemical and physical properties of matter like in different
    15·1 answer
  • Why does a hot water bottle feel warm? Options: Molecules in the hot water bottle are moving faster than molecules in the skin.
    8·2 answers
  • How many atoms are in 131.97 liters of water vapor at STP?
    11·1 answer
  • How many kinds of atoms are in a pure substance?
    7·2 answers
  • The starting position of this object is m. The object is traveling at a velocity of m/s.
    14·2 answers
  • Which statement best describes evidence that a chemical reaction occurs as a cake bakes
    11·2 answers
  • Predict the products when aqueous solutions of sodium carbonate and calcium chloride are combined.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!