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Kay [80]
3 years ago
7

What mass of ammonium thiocyanate must be used if it is to react completely with 6.5 g barium hydroxide octahydrate?

Chemistry
1 answer:
Molodets [167]3 years ago
6 0
<span>The reaction equation is:
Ba(OH)</span>₂<span>*8H</span>₂<span>O + 2NH</span>₄<span>SCN(s) </span>→<span> Ba(SCN)</span>₂<span>(s) + 10H</span>₂<span>O(l) + 2NH</span>₃<span> (g)

The molecular mass of barium hydroxide octahydrate is 315 grams /mol.
We determine the number of moles of barium hydroxide octahydrate:
moles = mass / Mr
moles = 6.5 / 315
moles = 0.02 mol

Using the equation, we can determine that the moles of ammonium thiocyanate required are:
2 * 0.02 = 0.04 mol

The molecular weight of ammonium thiocyanate is 76.1 grams / mol

Weight = moles * Mr
Weight = 0.04 * 76.1
Weight = 3.04 grams


3.04 grams of ammonium thicyanate are required.</span>
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A binary compound created by reaction of bismuth and an unknown element E contains 52.07% Bi and 47.93% E by mass. If the formul
yulyashka [42]

Answer:

Atomic mass of E is 128.24

Explanation:

  • The percentage composition by mass of an element in a compound is given by dividing the mass of the element by the total mass of the compound and expressing it as a percentage.
  • In this case; the compound Bi₂E₃

Percentage composition of bismuth = 52.07%

Percentage composition of E = 47.93%

Mass Bismuth in the compound is (2×208.9804) = 417.96 g

Therefore,

To calculate the atomic mass of E

52.07% = 417.96 g

47.93% = ?

            = (47.93 × 417.96 ) ÷ 52.07 %

            = 384.729

         E₃ = 384.729

Therefore; E = 384.729 ÷ 3

                     = 128.24  

The atomic mass of E is 128.24

6 0
3 years ago
Write BE if the statement is Beneficial Effect to the sun’s heat and light, HE if it is Harmful Effect of the sun’s heat and lig
mrs_skeptik [129]

Based on exposure time and place, the Sun's radiation may have harmful or beneficial effects.

<h3>What is solar radiation?</h3>

Solar radiation refers to the radiation from the Sun in the form heat, light and other forms of radiation.

The radiation from the Sun may have harmful or beneficial effects.

The effects of the Sun's radiation can be classified as BE, HE or SP as follows:

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  • SP- Use sunblock lotion with SPF 15 during hot days.
  • BE- With the presence of sunlight, farmers can dry their crops.
  • HE- UV rays can damage the tissue in your eyes.
  • BE- Research says that sunlight helps moods.
  • HE- Too much exposure from the sun can cause skin cancer.
  • SP- Use sunglasses when you stay under the sun.
  • SP- Wear a wide- brimmed hat on sunny days.
  • BE- Humans can do recreational activities on a sunny day.
  • SP- Wear sunglasses that filter UV light.
  • HE- Prolonged exposure to the sun’s heat makes your skin age faster than normal.
  • HE- Too much heat from the sun can cause heat stroke and loss of water.
  • BE- Sunlight helps strengthen your immune system.
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  • SP- Avoid sun in the middle of the day, from about 10 a.m. to 3 p.m.

Learn more about Sun's radiation at: brainly.com/question/921530

#SPJ1

6 0
2 years ago
Who invented the periodic table
Goryan [66]
Dmitri Mendeleev invented the periodic table.
4 0
3 years ago
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How many moles of CCl4 are in 3.55L
marishachu [46]

Answer: 0.16 moles

Explanation: According to Avogadro's law, 1 mole of every gas at STP occupies a volume of 22.4 Liters.

Given: Volume occupied = 3.55 L

From Avogadro's law,

22.4 L of CCl_4 corresponds to= 1 mole

3.55 L of CCl_4 correspond to=\frac{1}{22.4}\times 3.55=0.16moles

6 0
3 years ago
martha needs to determine the density of gasoline she has determined the mass to be 1250g and the volume to be 1500ml what is th
qaws [65]

0.833 g/mL

Density = mass/volume = (1250 g)/(1500 mL) = 0.833 g/mL

7 0
3 years ago
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