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vlabodo [156]
4 years ago
11

A sample of gold has a mass of 15.7 g and displaces 0.81 cm3 of eater in a graduated cylinder. What is the density of gold?

Chemistry
1 answer:
Ostrovityanka [42]4 years ago
3 0

Answer: 19.4 g/cm3

Explanation: density is the relationship between mass over volume.

So density of gold is 15.7g/0.81cm3 = 19.4 g/cm3

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write a skeletal equation for the following reaction: An aqueous solution of barium nitrate and an aqueous solution of sodium su
belka [17]

Answer: skeletal equation : Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow NaNO_3(aq)+BaSO_4(s)

The products are sodium nitrate and barium sulphate.

balanced equation :  Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow 2NaNO_3(aq)+BaSO_4(s)

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

The skeletal equation is:

Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow NaNO_3(aq)+BaSO_4(s)

The balanced chemical equation is:

Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow 2NaNO_3(aq)+BaSO_4(s)

7 0
3 years ago
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5 0
3 years ago
Calculate the number of grams of COOH 3 CH in the vinegar.
IRINA_888 [86]

If you are given the number of moles of sodium bicarbonate, use the balanced chemical equation. The molar mass of the acetic acid is 60 grams per mole. Using stochiometric balance.

 

Number of moles of acetic acid = 3 moles NaHCO3 (1 mol CH3COOH/1 mol NaHCO3) = 3 moles of acetic acid

Grams of acetic acid = 3 moles of CH3COOH (60 g CH3COOH/1 mol CH3COOH) = <span>180 grams of acetic acid</span>

4 0
3 years ago
How many copper atoms are in a pure copper statue with a mass of 132 kg
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eimsori [14]

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According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

3 0
2 years ago
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