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KonstantinChe [14]
3 years ago
6

Is the dissolving process for most salts endothermic or exothermic?

Chemistry
1 answer:
natali 33 [55]3 years ago
3 0
It is an endothermic process
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what volume of hydrogen gas is evolved from a reaction between 0.52 g of Na and water? This gas is collected at 20 C and 745mmHg
guapka [62]
The  volume of  hydrogen  gas  that evolved  is   calculated  as  follows
by  use  of   ideal  gas  equation

that  is  PV = nRT
P=745  mm hg
V= ?
R(gas  constant)= 62.36 L.mm hg/mol.k
T= 20 + 273 = 293 k
n=number  of  moles which is calculated as  follows
find the  moles  of Na  used
= 0.52/23=0.023  moles

write the reacting equation
2Na +2H2O =2NaOH +H2
by  use  of reacting  ratio  between  Na : H2  which  is  2:1  therefore  the mole  of H2 = 0.023/2 =0.0115  moles

by  making  the  volume  the   subject  of  the formula
v=nRT/P
V= (0.0115 x 62.36  x 293) / 745  = 0.283 L


6 0
3 years ago
Can someone help me please
almond37 [142]

Answer:D

Explanation:

  1. Use the vertex form, y=a(x−h)2+ky=a(x-h)2+k, to determine the values of aa, hh, and kk.a=14a=14h=6h=6k=1k=1Find the vertex (h,k)(h,k).(6,1)(6,1)Find pp, the distance from the vertex to the focus.
  2. Find the distance from the vertex to a focus of the parabola by using the following formula.14a14aSubstitute the value of aa into the formula.14⋅1414⋅14Simplify.
  3. Combine 4 and 1/4 .1 /4/4
  4. Simplify by dividing numbers
  5. Divide 4 by 44.1/1Divide 1 by 1/1.
  6. Y=0
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5 0
2 years ago
Coyotes and oak trees are unicellular organisms?
nordsb [41]

Answer :

<h2>Multicellular organisms</h2>

Explanation :

Coyotes are multicellular organisms.

Trees are multicellular organisms. They are made up of eukaryotic cells, which are complex cells full of organelles.

4 0
3 years ago
9.31g is the same mass as ?
Dmitry_Shevchenko [17]

Answer:

9.31 g = 0.00931 kg

Explanation:

We need to tell that 9.31 gram is same as what. There are many units that measure the meass of an object like milligram, kilogram, centigram etc.

The relation between kilogram and gram is as follows :

1 kg = 1000 g

or

1 g = 0.001 kg

If we change 9.31 gram to kg, we get :

9.31 g = (9.31 × 0.001) kg

or

9.31\ g=9.31\times 10^{-3}\ kg\\\\=0.00931\ kg

Hence, 9.31 g is the same mass as 0.00931 kg.

7 0
3 years ago
A flexible weather balloon contains helium gas at a volume of 855 L. Initially, the balloon is at sea level, where the temperatu
Alchen [17]

Answer: The change in the volume of the balloon is 144.4L

Explanation: Please see the attachments below

8 0
3 years ago
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