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Maksim231197 [3]
3 years ago
7

A 3.00 g mass of compound x was added to 50.0 g of water and it is found that the freezing point has decreased by 1.25 degrees c

elcius. What is the molar mass of X if it has a van’t Hoff factor of 3?
Chemistry
1 answer:
zloy xaker [14]3 years ago
3 0

Answer:

yes

Explanation:

suck abbc

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Calculate the mass of water produced when 42 g of propane, c3h8, is burned with 115 g of oxygen
gavmur [86]
The balanced combustion reaction of propane, C₃H₈, is

C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

Molar mass of propane: 44 g/mol
Moles of propane = 42 g * (1 mol/44g) = 0.9545 mol propane

Molar mass of oxygen: 32 g/mol
Moles of oxygen = 115 g * (1 mol/32 g) = 3.594 mol oxygen

Moles of oxygen needed to completely react propane:
0.9545 mol propane * (5 mol O₂/1 mol propane) = 4.7725 mol oxygen

Since the available oxygen is only 3.594 moles and propane needs 4.7725 moles, that means oxygen is our limiting reactant. We base the amount of water produced here.

Molar mass of water: 18 g/mol
Mass of water produced = 3.594 mol O₂ * (4 mol H₂O/5 mol O₂) * (18 g/mol)
Mass of water produced = 258.768 grams
6 0
3 years ago
How many moles of oxygen gas are required to form 55g of carbon monoxide gas
marta [7]

Answer:

8.33 moles CO2 X. 25mol O2. 16mol CO2. = 13.0 moles

6 0
3 years ago
A student with an unknown code of Q3A conducts a qualitative analysis of her unknown. Her results indicated the formation of a y
insens350 [35]

Answer:

Grey precipitate implies the presence of silver ions

Yellow precipitate implies the presence of lead II ions

Explanation:

Qualitative analysis provides us a quick method of identifying ions present in a sample by chemical reactions involving simple reagents. Precipitates having a unique colour is formed. The identity of ions in the sample is deduced from the colour of precipitate obtained when particular reagents are added.

In the question, a precipitate containing silver ions upon standing turn into grey colour. Similarly, lead II ions give a yellow precipitate.

6 0
3 years ago
How many significant gigures are in each mesasurments 303,000mm
Triss [41]
3 Sig FIgs in 303,000 mm
Any nonzero is a sig fig.
Any zero between two non zeros is a sig fig.
5 0
3 years ago
A(n) ________ is an assemblage of minerals bound together, a mass composed of a single mineral, a mass of undifferentiated mater
Sliva [168]

Answer:

Rock

Explanation:

Rock -

It refers to the naturally occuring mass of mineral , with a uniform chemical composition , is referred to as a rock .

In the crust of the Earth , the composition is by the igneous rocks .

<u>There are three main type of rocks , i.e. , </u>

  • sedimentary rocks ,
  • metamorphic rocks ,
  • igneous rocks .

Hence , from the given information of the question ,

The correct term is rock.

8 0
3 years ago
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