exam one lol f me up

An atom of chlorine is represented by 37/17Cl. How many neutrons are in the nucleus of this atom?

neutrons in 37/17Cl = 20

A certain metal hydroxide, M(OH)2, contains 32.8% oxygen by mass. What is the identity of the metal M?

Copper

Find the number of atoms in a copper rod with a length l of 9.85 cm and a radius r of 1.05 cm . The density of copper is 8.96 g/cm3 . (The volume of a cylinder is V=πr2l.)

amount = 2.90×1024 atoms of Cu

Formula: MgSO4 Name: Manganese (II) sulfite Which of the following statements identifies why this formula-name combination is wrong?

SO2−4 is sulfate. Magnesium is not a transition metal, so no Roman numeral should be used in naming it. Mg is magnesium. ****All of the statements are correct.

Find the number of ibuprofen molecules in a tablet containing 200.0 mg of ibuprofen (C13H18O2).

amount = 5.839×1020 molecules of C13H18O2

How many carbon atoms are there in a 1.3-carat diamond? Diamonds are a form of pure carbon. (1 carat = 0.20 g.)

amount = 1.3×1022 carbon atoms

A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this compound. What are the subscripts in the empirical formula of this compound?

1, 2, 1

A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this compound. What are the subscripts in the empirical formula of this compound?

1,2,1 // CH2O

How many fluroine atoms are present in 5.82 g of C2F4?

1.40×10^23 atoms

The fuel used in many disposable lighters is liquid butane, C4H10. How many carbon atoms are in 4.00 g of butane?

1.66×10^23carbon atoms

A flask contains 0.290 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask.

1.75×1023 molecules

What is the symbol for the carbon isotope with seven neutrons?

13/6C

Calculate the mass of 1.00×1024 (a septillion) molecules of water.

29.9 g

Give the nuclear symbol for the isotope of silicon for which A=29?

29/14Si

A wooden block has a volume of 22.9 in3. Express the volume of the cube in cm3.

3.75 cm^3

Bromine has two naturally occurring isotopes (Br−79 and Br−81) and has an atomic mass of 79.904 amu. The mass of Br−81 is 80.9163 amu, and its natural abundance is 49.31%. What is the natural abundance of Br-79? Calculate the mass of Br-79.

50.69% 78.92 amu

A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this compound. The molecular formula mass of this compound is 180 amu . What are the subscripts in the actual molecular formula?

6,12,6

Determine the number of atoms in 1.70 mL of mercury. (The density of mercury is 13.5 g/mL.)

6.89×10^22 atoms

A compound is 40.0% C, 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this compound. The molecular formula mass of this compound is 240 amu . What are the subscripts in the actual molecular formula?

8,16,8

An element has four naturally occurring isotopes with the masses and natural abundances given here. Isotope Mass (amu) Abundance (%) 1 135.90714 0.1900 2 137.90599 0.2500 3 139.90543 88.43 4 141.90924 11.13 Find the atomic mass of the element. Identify the element.

A = 140.1 amu The element is cerium.

A certain ionic compound is made entirely of aluminum and oxygen. What is the formula for this compound? What is the mass percentage of each element in the compound Al2O3?

Al2O3 % Al,% O = 52.9%, 47.1%

What is the systematic name of NH4ClO3?

Ammonium Chlorate

An atom has a mass number of 32 and 17 neutrons. What is the atomic number of this atom?

Atomic number= 15

Sucrose, the sugar extracted from sugarcane and sugar beets, is an organic compound that contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms per molecule. What is the chemical formula for sucrose?

C12H22O11

Ibuprofen has the following mass percent composition: C:H:O:75.69% 8.80% 15.51% What is the empirical formula of ibuprofen?

C13H18O2

A compound is 80.0% carbon and 20.0% hydrogen by mass. Assume a 100.-g sample of this compound. Based on the mole ratio you determined in Part C, what is the empirical formula of this compound?

CH3

What is the formula for the compound methane?

CH4

What is the name of the covalent compound CCl4?

Carbon tetrachloride

What is the name of the acid whose formula is H2CO3?

Carbonic Acid

What is the name of the covalent compound N2O5?

Dinitrogen Pentoxide

What is the formula for sulfurous acid?

H2SO3

What is the formula for chlorous acid?

HClO2

Enter the formula for the compound formed between potassium and sulfur.

K2S

What is the systematic name of PbO?

Lead (II) oxide

A sugar crystal contains approximately 2.2×1017 sucrose (C12H22O11) molecules. What is its mass in mg?

M= 0.13mg

What is the systematic name of Mg(NO3)2?

Magnesium nitrate

The atomic number of oxygen is 8. What is the mass number of a oxygen atom with 7 neutrons?

Mass number= 15

Butane (C4H10) is the liquid fuel in lighters. How many grams of carbon are present within a lighter containing 7.25 mL of butane? (The density of liquid butane is 0.601 g/mL.)

Mass of carbon= 3.60 g

Determine the mass of oxygen in a 7.2-g sample of Al2(SO4)3.

Mass of oxygen = 4.0 g

How many carbon atoms are there in a 1.6-carat diamond? Diamonds are a form of pure carbon. ( 1 carat=0.20 grams)

N = 1.60×10^22 carbon atoms

What is the formula for the compound nitrogen monoxide?

NO

What is the empirical formula for the compound P4O6?

P2O3

What is the formula for the compound tetraphosphorus decoxide?

P4O10

What is the chemical formula for quartz?

SiO2

Name the compound Ag3N.

Silver Nitride

What is the name of XeF4?

Xenon Tetrafluoride

What are the atomic number and mass number for the carbon isotope with seven neutrons?

Z,A= 6,13

Magnesium has three naturally occurring isotopes with masses of 23.99, 24.99, and 25.98 amu and natural abundances of 78.99%, 10.00%, and 11.01%, respectively. Calculate the atomic mass of magnesium.

atomic mass = 24.31 amu

A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the following hydrocarbon: C 7 H 16 .

carbon, hydrogen = 83.90%, 16.10%

What is the name of the acid whose formula is HI?

hydroiodic acid

A titanium cube contains 2.86×1023 atoms. What is the edge length l of the cube? The density of titanium is 4.50 g/cm3 . (The volume of a cube is V=l3.)

l= 1.72cm

What is the mass of a sample of water containing 3.55×1022 molecules of H2O?

mass = 1.06 g

Gallium has two naturally occurring isotopes: 69Ga with a mass of 68.9256 amu and a natural abundance of 60.11% and 71Ga. Use the atomic mass of gallium from the periodic table to find the mass of gallium-71.

mass = 70.92 amu

A compound is 80.0% carbon and 20.0% hydrogen by mass. Assume a 100.-g sample of this compound. How many grams of each element are in this sample?

mass of C, mass of H = 80.0, 20.0 g

Sucrose, the sugar extracted from sugarcane and sugar beets, is an organic compound that contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms per molecule. How much does one sucrose molecule weigh in grams?

mass of one molecule of sucrose = 5.68×10−22 g

Calculate the mass of 2.25×1022 tungsten atoms.

mass of tungsten = 6.87 g

A compound is 80.0% carbon and 20.0% hydrogen by mass. Assume a 100.-g sample of this compound. How many moles of each element are in this sample?

moles of C, moles of H = 6.66, 19.8 mol

How many oxygen atoms are in 2.30 g of quartz?

number of O atoms = 4.62×1022

Which subatomic particle(s) are found in the nucleus of the atom?

proton & neutron

How many protons and neutrons are present in an atom of 3919K?

protons, neutrons = 19,20