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3 years ago

Hi, i need help.. please

Chemistry

1 answer:

11111nata11111 [884]3 years ago

5 0

4 because of the measurements and the figures starts from 0 to 40

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1 point

blsea [12.9K]

Answer:

It freezes at 32 f

Explanation:

6 0

3 years ago

Given the NaOH density =1.0698g mL^-1, How many mL of .71M HCl would be required to neutralize 11.33g of 2.03 M NaOH?

SSSSS [86.1K]

The volume in ml of 0.71 M HCl that would be required to neutralize 11.33 g of 2.03 M NaOH is 30.3 ml

<u><em>calculation</em></u>

Step 1 : write equation for reaction

NaOH + HCl →NaCl +H₂O

Step 2:find the volume of NaOH

volume=mass/ density

= 11.33 g/ 1.0698 g/ml =10.59 ml

Step 3: find the moles of NaOH

moles = molarity x volume in liters

molarity= 2.03 M=2.03 mol/l

volume in liters =10.59/1000 =0.0106 L

moles = 2.03 M x 0.0106 L =0.0215 moles

step 4: use the mole ratio to determine the moles of HCl

from equation in step 1 , NaOH:HCl is 1:1 therefore the moles of HCl is also 0.0215 moles

Step 5: find volume of HCl

volume= moles/ molarity

molarity =0.71 M =0.71 mol/l

=0.0215 moles /0.71 mol/l=0.0303 L

into ml =0.0303 x 1000=30.3 ml

3 0

3 years ago

If your mixing cement for the foundation of a building and it calls for 1.55 tons of sand, how many grams of a sand are you usin

Damm [24]

Answer:

1406136 grams

Explanation:

6 0

3 years ago

The molecules of DNA produced in replication are (blank)

mixas84 [53]

A. Identical :) Hope it helps

7 0

3 years ago

Read 2 more answers

The H atom and the Be3³⁺ ion each have one electron. Does the Bohr model predict their spectra accurately? Would you expect thei

lbvjy [14]

Explanation:

a) Bohr model is perfect for atoms that have single electron and fortunately both Be3+ ion and H atom have one electron so, Bohr model can easily and accurately applied to predict the spectrum of Be3+ and H atom.

b) The energy of an atom in Bohr model is given by

$E= \frac{-13.6z^2}{n^2}$

the values of z for H atom and Be3+ ion are 1 and 4 respectively. Hence, energy of atoms would be different for both atoms. Hence, line spectra to be identical is not possible.

4 0

3 years ago