1. A 5.05 g sample of quartz (SiO2) contains 2.36 g of silicon. What are the percentages of silicon and oxygen in quartz?
A) 53.3% Si and 46.7% 0
B) 46.7% Si and 53.3% 0
C) 29.9% Si and 70.1% 0
D) 70.1% Si and 29.9% 0
E) 46.7% Si, and insufficient information to calculate %O

The mass percent of silicon in quartz has been 46.7%, and the mass percent of oxygen has been 53.3%. Thus, option B is correct.

Mass percent can be described as the percent composition of an element in a chemical compound. Percent of element can be given as:

Percent mass =

The mass of silicon in the sample has been = 2.36 grams

The total mass of sample = 5.05 grams.

The percent mass of silicon can be given as:

Percent mass of silicon =

Percent mass of silicon = 46.7%

The compound has been composed of silicon and oxygen. Thus, the mass percent of quartz can be given as:

100%  Quartz = %Silicon + % Oxygen

100% Quartz = 46.7% + % Oxygen

The mass % of oxygen = 100 - 46.7%

The mass % of oxygen = 53.3%

The mass percent of silicon in quartz has been 46.7%, and the mass percent of oxygen has been 53.3%. Thus, option B is correct.

For more information about the mass percent, refer to the link:

link

B) 46.7% Si and 53.3% O

Explanation:

To calculate the mass percent of element in a given compound, we use the formula:

Mass of quartz   = 5.05 g

Mass of silicon = 2.36 g

Mass of oxygen = Mass of quartz   - mass of silicon = 5.05g - 2.36 g = 2.69 g

Thus the percentages of silicon and oxygen in quartz are B) 46.7% Si and 53.3% O

yes

explanation:

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periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.