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Gennadij [26K]
3 years ago
14

Can you pls help me with this question

Chemistry
2 answers:
rosijanka [135]3 years ago
7 0

Answer:

probably c

Explanation:

Feliz [49]3 years ago
6 0

Answer: I feel like the correct answer is choice C but I really don’t know how to explain it..

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Free brainiest! the first person who makes me blush or makes me want to kiss you.
lawyer [7]

Answer:

Explanation:Do you like to draw coz you put the D in raw

3 0
3 years ago
Read 2 more answers
On a .75-meter table sits a book whose mass is .5 kilograms. How
Pie

Answer:

P.E = 3.675  J

Explanation:

Given data:

Height of table = 0.75 m

Mass of book = 0.5 kg

Potential energy = ?

Solution:

Formula:

P.E = mgh

g =acceleration due to gravity =  9.8 m/s²

by putting values,

P.E = 0.5 kg× 9.8 m/s² ×0.75 m

P.E  = 3.675 kgm²/s²

J = kgm²/s²

P.E = 3.675  J

5 0
3 years ago
Read 2 more answers
How many grams of water react to form 7.21 moles of Ca(OH)2
oksano4ka [1.4K]

You have the stoichiometric equation. This tells you unequivocally that an  

18

⋅

g

mass of water, 1 mole, reacts with a  

56.07

⋅

g

mass of quicklime to form a  

74.09

⋅

g

mass of slaked lime.

If you don't from where I am getting these numbers, you should know, and someone will be willing to elaborate.

Here, you have formed  

6.21

⋅

m

o

l

of quicklime which requires stoichiometric lime AND water. And thus you need a mass of  

6.21

⋅

m

o

l

×

18.01

⋅

g

⋅

m

o

l

−

1

water  

≅

88

⋅

g

.

In practice, of course I would not weigh out this mass. I would just pour  

100

−

200

⋅

m

L

of water into the lime.

7 0
3 years ago
How many moles of sodium are present in 17 g of Na?
11Alexandr11 [23.1K]

Answer:

1. 0.74mol

2. 0.42mol

3. 2.125mol

4. 0.301mol

5. 4.52 × 10^23 particles

Explanation:

Number of moles (n) in a substance can be found using the formula:

mole (n) = mass/molar mass

Using this formula, the following moles are calculated:

1. Molar of Na = 23g/mol

mole = 17/23

mole = 0.74mol

2. Molar mass of Na2SO4 = 23(2) + 32 + 16(4)

= 46 + 32 + 64

= 142g/mol

Mole = 60/142

mole = 0.42mol

3. Molar mass of CO2 = 12 + 16(2)

= 12 + 32

= 44g/mol

mole = 93.5/44

mole = 2.125mol

4. Molar mass of sodium nitrate (NaNO3) = 23 + 14 + 16(3)

= 23 + 14 + 48

= 85g/mol

mole = 25.6/85

mole = 0.301mol

5. Number of particles in one mole of a substance is 6.022 × 10^23 particles. Hence, in 0.75mol of calcium hydroxide (Ca(OH)2, there will be;

0.75mol × 6.02 × 10^23

= 4.515 × 10^23

= 4.52 × 10^23 particles

8 0
3 years ago
How many moles of acetylene are needed to completely react with 16.5g of CO2
kykrilka [37]

Answer:

0.375 mols

Explanation:

  1. Relative atomic mass Ar of C=12×1=12
  2. Relative atomic mass Ar of O=16×2=32
  3. Realitive formula mass Mr is 12+32=44

mol:mass

1 : 44

x :16.5

cross multiply and get the answer

5 0
3 years ago
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