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3 years ago

What is the mass in grams of 1.73 moles CaH2

Chemistry

1 answer:

Nata [24]3 years ago

4 0

Mass in grams = no. of moles multiply by molar mass
molar mass is 42 so by putting value we get 72.66 grams...

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Tatiana [17]

The answer will be the cell membrane

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3 years ago

What is the minimum % relative error for a 0.5M NaOH solution?

scZoUnD [109]

Answer: 20%

Explanation:

Relative error = Absolute error/actual value

= 0.1/0.5

= 0.2

Hence,

Minimum % Relative error = 0.2 ×100%

= 20%

4 0

4 years ago

Read 2 more answers

What are the two parts of a solution?

Vlad [161]

The 2 parts or components that make up a solution would be the solute and the solvent.

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3 years ago

1. convert 8.43 x 1025 atoms of Fe to moles

Luba_88 [7]

Answer:

The number of moles of Fe are, 139.9 moles.

The number of moles of CO are, 7.89 moles.

The number of moles of Al are, $4.04\times 10^{-4}$ moles.

Explanation :

As we know that 1 mole of substance contains $6.022\times 10^{23}$ atoms or molecules.

Part 1:

As, $6.022\times 10^{23}$ atoms of Fe present in 1 mole

So, $8.43\times 10^{25}$ atoms of Fe present in $\frac{8.43\times 10^{25}}{6.022\times 10^{23}}\times 1=139.9$ mole

Thus, the number of moles of Fe are, 139.9 moles.

Part 2:

As, $6.022\times 10^{23}$ molecules of CO present in 1 mole

So, $4.75\times 10^{24}$ molecules of CO present in $\frac{4.75\times 10^{24}}{6.022\times 10^{23}}\times 1=7.89$ mole

Thus, the number of moles of CO are, 7.89 moles.

Part 3:

As, $6.022\times 10^{23}$ atoms of Al present in 1 mole

So, $2.43\times 10^{20}$ atoms of Al present in $\frac{2.43\times 10^{20}}{6.022\times 10^{23}}\times 1=4.04\times 10^{-4}$ mole

Thus, the number of moles of Al are, $4.04\times 10^{-4}$ moles.

4 0

3 years ago

Calculate the density of methanol (CH3OH)?

myrzilka [38]

This question is incomplete so because of unavailability of proper information i will simply let you understand this by an example:
lets say you have 4.2 moles of methanol in 5.67 L.

Firstly convert the moles into mass

mass = moles x molar mass of methanol

mass = 4.2 moles x 32.05 g/mol = 134.61 g 

Density = mass / vol 
convert 5.67L into mL which is 5670mL
putting values
134.61 / 5670 mL = 0.0237 g/mL
hope you get it!

5 0

3 years ago