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hoa [83]
3 years ago
15

Help me with science for brainiest:)

Chemistry
2 answers:
Morgarella [4.7K]3 years ago
8 0
The answer is C! I hope this helps!
Wittaler [7]3 years ago
3 0

<em>Answer:</em>

<em> The answer is C. Plasma</em>

<em />

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A sample of hydrated tin (II) chloride (SnCl2) has a mass of 4.90 g. When it is dehydrated, it has a mass of 4.10 g. Which is th
Usimov [2.4K]

Answer:

SnCl₂·2 H₂O.

Explanation:

Relative atomic mass data from a modern periodic table:

  • Sn: 118.710;
  • Cl: 35.45;
  • H: 1.008;
  • O: 15.999.

How many moles of SnCl₂ formula units in this sample?

The first mass 4.90 grams contain both the SnCl₂ formula units and a number of water molecules. Luckily, the mass of the dehydrated salt 4.10 grams contains only SnCl₂.

Formula mass of tin (II) chloride SnCl₂:

M(\rm SnCl_2) = 118.710 + 2\times 35.45 = 189.610\; g\cdot mol^{-1}.

Number of moles of tin (II) chloride SnCl₂ formula units in this sample:

\displaystyle n(\mathrm{SnCl_2}) = \frac{m}{M} = \rm \frac{4.10\; g}{189.610\; g\cdot mol^{-1}} = 0.0216233\; mol.

How many moles of water molecules H₂O in this sample?

Water of crystallization exist as H₂O molecules in typical hydrated salts. The molar mass of these molecules will be:

M(\rm H_2O) = 2\times 1.008 + 15.999 = 18.015\; g\cdot mol^{-1}.

The mass of water in the hydrated salt is the same as the mass that is lost when the water molecules are removed and the salt is dehydrated.

In other words,

\begin{aligned}m(\text{Water of Hydration})&=m(\text{Hydrated Sample}) - m(\text{Anhydrous Sample}) \\ & = \rm 4.90\; g - 4.10\; g \\ &= \rm 0.80\; g\end{aligned}.

\displaystyle n(\mathrm{H_2O}) = \frac{m}{M} = \rm \frac{0.80\; g}{18.015\; g\cdot mol^{-1}} = 0.0444074\; mol.

What's the coefficient in front of water in the formula of this hydrated salt? In other words, how many water molecules are there in the compound for each SnCl₂ formula unit?

\displaystyle \frac{n(\mathrm{H_2O})}{n(\mathrm{SnCl_2})} = 2.05 \approx 2.

There are approximately two water molecules for each SnCl₂ formula unit. The formula of this compound shall thus be \rm SnCl_2 \cdot 2H_2 O.

6 0
3 years ago
Describe a light year.<br> Help ASAP please, doing an exam..
Romashka [77]

Answer:

Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year

Explanation:

Hope it helps

6 0
3 years ago
Why does NYS experience so few hurricanes compared to Florida?<br> Pictures are required
AURORKA [14]

Answer:

Explanation:Hurricane are fast moving that blows. It is formed over warm waterbodies and it can destroy lives and properties.

Florida is a state in united state while New york is an extention from florida. Florida is know to be contain many water bodies and the rise of warm water over time could lead to hurricane. Hurricane in New york will be few because its just a city in florida there are still many mkre cities in florida such that when hurricane occurs it of great impact.

6 0
3 years ago
A piece of wood near a fire is at 23°c. it gains 1,160 joules of heat from the fire and reaches a temperature of 42°c. the speci
Alex73 [517]

The mass of the piece of wood is 35.58 g.

Joule = M × T × C

Where, M = mass

T = change in temperature(42C-23C=19 C)

C = specific heat capacity = 1.716 joules/gram

Substituting the values in the equation,

1160 = M × 19 × 1.716

M = 1160/32.604 = 35.58 g

Therefore, the mass of the piece of wood = 35.58 g

<h3>What is meant by specific heat capacity?</h3>

A material's specific heat capacity, which is defined as its heat capacity divided by its mass, determines how much energy is required to increase a gram's temperature by one degree Celsius (or one Kelvin)

<h3>What is mass?</h3>

Mass is the quantity of matter in a physical body.

To learn more about specific heat capacity visit:

brainly.com/question/1747943

#SPJ4

7 0
1 year ago
Please check if i did it right. did i put the right electric charge
Ad libitum [116K]
Your protons are correct but it’s 28 neutrons not 27!
6 0
3 years ago
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