Using mass measurements, early chemists were able to determine that for pure sub

Question

Using mass measurements, early chemists were able to determine that for pure substances, the mass proportions of the composite elements were the same, no matter how much of the substance was analyzed. This became known as the law of definite proportions, or the law constant composition. Dalton interpreted that this constant mass composition arose from constant composition of atoms. Working with this concept will help you to better understand the particulate nature of matter. To answer the questions, refer to the structure of water and ammonia shown here (Figure 1) Part A What is the ratio of hydrogen atoms (H) to oxygen atoms (O) in 2 L of water? Enter the simplest whole number ratio in order of hydrogen to oxygen respectively. Express your answer as two integers, separated by a comma (e.g., 3, 4) ____ Part B How many atoms of hydrogen (H) are present in 200 molecules of ammonia (NH_3)? Express your answer numerically. _______ H atoms Part C

Explanation / Answer

Part A)

Water H2O consists of two hydrogen and one oxygen atoms

So the ratio = 2,1

Part B)

One molecule of NH3 has 3 atoms of hydrogen in it

So,

200 molecules of NH3 would have = 3 x 200 = 600 atoms of hydrogens

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