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coldgirl [10]
3 years ago
8

PLEASE HELP ME!!!! WILL GIVE BRAINLIEST!!!!

Chemistry
1 answer:
vitfil [10]3 years ago
4 0

Answer: 1. 3.23 m

2. 32.4

3. B  adding solvent  and C  removing solute

Explanation:

1. Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent

Molality=\frac{n}{W_s}

where,

n = moles of solute

W_s = weight of solvent

Now put all the given values in the formula of molality, we get

Molality=\frac{43.6mol}{13.5kg}=3.23mol/kg

2. Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n}{V_s}

where,

n = moles of solute

V_s = volume of solution in L

3.4=\frac{n}{9.54}

n=32.4

Therefore, the moles of Na_2CO_3 is 32.4

3. Molarity can be decreased by decreasing the moles of solute and by increasing the volume of solution.

Thus adding solvent  and removing solute will decrease the molarity.

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8 0
3 years ago
Based on the chemical bonds present in this molecule, we would classify it as a(n)
MrMuchimi

Answer is C – Unsaturated fat.

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8 0
3 years ago
Read 2 more answers
18.
Leno4ka [110]

Answer:

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Explanation:

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D is wrong. The high specific heat capacity of water doesn't heat the body, but it slows the rate at which it cools.

6 0
3 years ago
Read 2 more answers
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


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