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vazorg [7]
3 years ago
11

Mistry- Unit 5 Test 1 33 of 50

Chemistry
1 answer:
vodka [1.7K]3 years ago
6 0

Answer:

∆H fus = -∆H solid

Explanation:

Enthalpy of melting (fusion) is the enthalpy change when a substance melts. It is always endothermic (i.e heat is being absorbed). So ∆H is positive.

Enthalpy of freezing (solidification) is the enthalpy change when a substance freezes. It is negative that of melting.

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What is the molar mass of magnesium carbonate, MgCO3? 52.314 g/mol 84.313 g/mol 96.771 g/mol 102.588 g/mol
Orlov [11]

Answer:

Molar mass of MgCO3 = 84.3 g/mol

Explanation:

What is the molar mass of magnesium carbonate.

Molar mass of a substance is defined as the mass of one mole of the substance expressed in grams hence its unit is gram per mole (g/mol)

MgCO3 is a compound and it's molar mass would be the sum of the molar masses of the elements that make up the compound. MgCO3 contains 1 atom of magnesium, one atom of carbon and 3 atoms of oxygen

Molar mass of Magnesium = 24.3g

Molar mass of Carbon =12g

Molar mass of Oxygen = 16g

Molar mass of MgCO3 will be

24.3 + 12 + 16×3

= 24.3 + 12 +48 = 84.3 g/mol

Molar mass of MgCO3 = 84.3 g/mol

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