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

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101