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Vesnalui [34]
3 years ago
5

If a 9.983 g sample of calcium sulfate dihyrate was heated in a crucible under the correct conditions, how many grams of water s

hould be lost?
Chemistry
1 answer:
Studentka2010 [4]3 years ago
7 0

Answer:

2.090 g

Explanation:

The chemical formula of calcium sulfate dihydrate is CaSO₄.2H₂O.

  • The mass of 1 mole of CaSO₄ is 136.14 g.
  • The mass of 2 moles of H₂O is 2 × 18.02 g = 36.04 g.
  • The mass of 1 mole of CaSO₄.2H₂O is 136.14 g + 36.04 g = 172.18 g.

The mass ratio of CaSO₄.2H₂O to H₂O is 172.18 g:36.04 g. The mass of water lost upon the heating of 9.983 g of CaSO₄.2H₂O is:

9.983 g CaSO₄.2H₂O × (36.04 g H₂O/172.18 g CaSO₄.2H₂O) = 2.090 g H₂O

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Answer:

A. NaHCO₃

Explanation:

NaHCO₃ ⇒ NaOH + H₂CO₃

NaOH is a strong base and H₂CO₃ is a weak acid. Therefore, NaHCO₃ is a salt of a strong base-weak acid reaction. The salt is basic because carbonic acid (H₂CO₃) is a weak acid so it remains undissociated. So, there is a presence of additional OH⁻ ions that makes the solution basic.

Hope that helps.

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2 years ago
If 11g of a gas occupies 5.6dm'3at s.t.p., calculate it's vapour density (1.0mol of a gas occupies 22.4dm'3at s.t.p.).​
11111nata11111 [884]

Answer:

{ \boxed{ \bf{vapour \: density = 2 \times molecular \: mass}}} \\{ \tt{ PV= (\frac{m}{ m_{r}}) RT}} \\ { \tt{3 \times 5.6 =  \frac{11}{m _{r}}  \times 0.0831 \times 273}} \\ { \tt{m _{r} = 14.85 \: g}} \\  \\ { \bf{vapour \: density = 2 \times m _{r}}} \\  = 2 \times 14.85 \\  = 29.7 \: { \tt{g {dm}^{ - 3} }}

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Cyanide and water react in a proton transfer reaction to form hydrogen cyanide and hydroxide
alukav5142 [94]

The proton transfer reaction between Cyanide and water can be written as; X^- + H2O -----> HX + OH^-

<h3>What is a proton transfer reaction?</h3>

A proton transfer reaction is one in which a proton is moved from one chemical specie to another.It is in fact and acid - base reaction in the Brownstead - Lowry sense.

The proton transfer reaction between Cyanide and water can be written as(Let the cyanide ion be shown as X);

X^- + H2O -----> HX + OH^-

Learn more about proton transfer: brainly.com/question/861100?

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Anastaziya [24]

Explanation:

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The reactants in this expression above is limestone

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Reactant is the species that gives the product and it is usually found on the left hand side of the expression.

The product is the substance on the right hand side of the expression that forms through the experiment.

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