# Chemistry

You find a compound composed only of element x and hydrogen,and know that it is 91.33% element x by mass. Each molecule has 2.67 times as many H atoms as x atoms. What is element x ?

1. 👍 0
2. 👎 0
3. 👁 746
1. Take a 100 g sample. That will consist of
91.33 g element X and
8.67 g H. Convert to moles.

91.33/atomic mass X = moles X = (91.33/z) which I am calling the atomic mass z = moles element X. We also know that there are 2.67 x as many x atoms as there are H atoms.
8.67 g H/1 = 8.67 moles H.

So the empirical formula is
X(91.33/z)H8.67 + we know about the 2.67 so I set
2.67*91.33/z = 8.67 and solve for z.
If I didn't goof, I found z = 28.1 which probably is Si. Then
Si = 91.33/28 = 3.26
H = 8.67/1 = 8.67

Find the ratio and round to whole numbers. The easy way to do this is to divide the smallest number by itself (thus 1.00 for that one) and divide the other number of the same small number.
8.67/3.26 = 2.65. Now multiply each by whole numbers until you get two numbers close enough to round to whole numbers. I think a multiplier of 3 will do it.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### chemistry

The chemical substance in natural gas is a compound called methane. Its molecules are composed of carbon and hydrogen and each molecule contains four atoms of hydrogen and one atom of carbon. In this compound, 0.33597g of hydrogen

asked by Perry on August 23, 2011
2. ### Science

Can an element be separated from a compound? Can an element form a compound? The reaction of zinc metal and hydrochloric acid creates hydrogen gas, an element. if we create this element in a tube what property of this element

asked by Roma on February 16, 2014
3. ### A.P Chemistry

Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X

asked by T-Baby on October 23, 2006
4. ### A.P. Chemistry

Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X

asked by Lucy on October 2, 2011
5. ### Chemistry

Compound A reacts with element B (a halogen) to form compounds C and D as the only products. When 2.000 grams of B react with an excess of sodium metal 2.363 grams of the sodium halide are formed. Compound A is a volatile liquid

asked by Patrick on April 17, 2011
6. ### Chemistry

Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO

asked by Patrick on December 12, 2010
7. ### Chemistry

Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO

asked by Patrick on December 12, 2010
8. ### Chemistry

Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO

asked by Patrick on December 13, 2010
9. ### A.P Chemistry

Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X

asked by Brianna on October 23, 2006
10. ### Science-Chemistry

Analysis questions: A) What evidence is there that the gas bubbles formed in the first part of the investigation were hydrogen gas? Answer: Evidence there was that proved that the gas bubbles formed in the first part of the

asked by Immy on September 13, 2010

More Similar Questions