Question

pls guys help me I will mark you as brainlist if u answered the questions ​

Answer 1

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1) Chemistry is the study of the transformation of matter from one form to the other. These transformations often occur as a result of the combination of two different types of matter. The combination of different elements to form compounds is governed by certain basic rules. These rules are referred to as laws of chemical combination. There are five basic laws of chemical combination that govern the chemical combinations of elements:

• Law of conservation of mass

• Law of definite proportion

• Law of multiple proportion

• Gay lussac's Law of Gaseous Volume

• Avogadros Law

2) Postulates of Dalton’s Atomic Theory

• All matter is made up of tiny, indivisible particles called atoms.

• All atoms of a specific element are identical in mass, size, and other properties. However, atoms of different element exhibit different properties and vary in mass and size.

• Atoms can neither be created nor destroyed. Furthermore, atoms cannot be divided into smaller particles.

• Atoms of different elements can combine with each other in fixed whole-number ratios in order to form compounds.

• Atoms can be rearranged, combined, or separated in chemical reactions.

3) In chemistry, the molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles.

4)No.of moles = Given weight ÷ Molar weight

5)

MgSO4 ≈≈> 120.366 g/mol

My(NO3)2 ≈≈> 148.3 g/mol

CaSO4 ≈≈> 136.14 g/mol

Ca3(PO4)2 ≈≈> 310.18 h/mol

6) formula ≈≈> given wt ÷ molar wt

a] 7 ÷ 28 = 0.25 × Na

b] 8 ÷ 32 = 0.25 × Na

c] 32÷ 42 = 0.76 × Na

d] 84 ÷ 84 = 1 × Na

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