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4 years ago

How many grams of sodium chloride are present in a 0.75 M solution with a volume of 500.0 mililiters

1 answer:

5 0

C = 0,75 mol/dm³
V = 500mL = 500cm³ = 0,5dm³

C = n/V
n = 0,75×0,5dm³
n = 0,375 moles

M NaCl: 23+35,5 = 58,5g

1 mole ---------- 58,5g
0,375 ----------- X
X = 0,375×58,5
X = 21,9375g NaCl

:)

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3 years ago

Calculate the pH of a solution that is 0.113 M HCI.

Alex Ar [27]

Simplified concentration

$\\ \rm\Rrightarrow 1.13\times 10^{-2}M$

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$\\ \rm\Rrightarrow pH=-log[H^+]$

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2 years ago

A solution of ammonia and water contains 2.60×1025 water molecules and 6.90×1024 ammonia molecules. how many total hydrogen atom

marshall27 [118]

1 molecule of NH3 has 3 atoms of H.
6.90*10²⁴ molecules NH3 have 3*6.90*10²⁴ =20.7*10²⁴ atoms H=2.07*10²⁵ atoms H

1 molecule H2O of has 2 atoms of H.
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4 0

3 years ago

Convert 8.4 • 10^16 molecules of CO2 to moles

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Answer:

0.00000000000000084

Explanation:

8 0

3 years ago

Identify each of the following elements as an actinide, an alkali metal, an alkaline-earth metal, a halogen, a lanthanide, a met

dezoksy [38]

Answer:

Antimony - metalloid

Tungsten- Transition metal

Argon - Noble gas

Iron - Transition metal

Bromine- Halogen

Cesium- Alkali metal

Cerium- lanthanide

Uranium - Actinide

Calcium- Alkaline earth metal

Lithium - Alkaline metal

Explanation:

Lithium is an alkaline metal because it belongs to group 1 of the periodic table. This is the general name for the group.

Calcium is an alkaline earth metal as it belongs to group 2 of the periodic table. This is the general name of the group.

Uranium is an actinide as it belongs to the second series of the f block

Cerium is the second element in the lanthanide series after lanthanum

Cesium belongs to group 1 and hence is an alkaline metal.

Bromine is a halogen as it belongs to group 7 of the periodic table

Iron is a transition metal as it belongs to the first series of transition metals

Argon is s noble gas as it belongs to group 18

Tungsten is s transition element and it belongs to the third series

Antimony is a metalloid

8 0

3 years ago