Lady

Explain how you would use a codon table to translate an mRNA.

How many joules of energy are needed to change 138 g of water at 12.8°C to steam at 100°C?

help please!?

At 25 °C and 760 torr pressure, what will be the volume of 77 mol of H2 gas? (Enter your answer in scientific notation.)

× 10 L H2

At what Kelvin temperature will 44.1 grams of oxygen occupy a volume of 13.5 L at a pressure of 867 torr?

? K

Balance each of the following equations, then change them into balanced net ionic equations:

(Enter only the net ionic equation and include the state of each reactant/product.)

A) K3PO4(aq) + Ca(NO3)2(aq) ----> Ca3(PO4)2(s) + KNO3(aq)

B) Al(s) + H2SO4(aq) -----> H2(g) + Al2(SO4)3(aq)

C) Na2CO3(aq) + HCl(aq) ----> NaCl(aq) + H2O(l) + Co2(g)

Hydrazine (N2H4) and hydrogen peroxide (H2O2) have been used as rocket propellants. They react according to the following equation:

7H2O2 + N2H4 → 2HNO3 + 8H2O

a) When 65 kg of hydrazine react, how many grams of nitric acid can be formed?

? × 10 g

b) When 180 mL of hydrogen peroxide (d = 1.41 g/mL) react, how many grams of water can be formed?

?g

c) How many grams of hydrazine will be required to react with 766 g hydrogen peroxide?

?g

d) How many grams of water can be produced when 158 g hydrazine combine with 127 g hydrogen peroxide?

?g

e) How many grams of the excess reactant in part (d) are left unreacted?

?g

Polychlorinated biphenyls (PCBs), which were formerly used in the manufacture of electrical transformers, are environmental and health hazards. They break down very slowly in the environment. The decomposition of PCBs can be represented by the equation:

(a) How many moles of water are needed to react with 13.5 mol O2?

?mol H2O

(b) How many grams of HCl are produced when 17.6 mol H2O react?

× 10 g HCl

(c)How many moles of CO2 are produced when 90.4 g HCl are produced?

?mol CO2

(d) How many grams of C12H4Cl6 are reacted when 106.01 g of CO2 are produced?Note: Use three significant digits in your answer.

? g C12H4Cl6

(e) How many grams of HCl are produced when 4.2 kg C12H4Cl6 react?

? × 10 g HCl

please show me step by step, thanks!

In a blast furnace, iron(III) oxide reacts with coke (carbon) to produce molten iron and carbon monoxide:

Fe2O3 + 3C → 2Fe + 3CO

How many kilograms of iron would be formed from 131 kg of Fe2O3?

??kg

Need help, thanks!

Many pigments are composed of ionic compounds. For each of the pigments listed below, write a complete balanced equation to synthesize the pigment using the reagents listed in parentheses.

1)

Cadmium yellow, CdS (CdCl2(aq) + Li2S(aq))

2)

Vermillion, HgS (Hg(NO3)2(aq) + Na2S(aq))

3)

Titanium black, Ti2O3 (Ti(s) + O2(g))

4)

White lead, PbCO3 (Pb(C2H3O2)2(aq) + H2CO3(aq))

Write the formula, total ionic and net ionic equations for the following reactions. Give only the formula and net ionic equations for your answer. Be sure to include all physical states.

(a) HNO3 + LiOH

Formula equation:

Net ionic :

(b) HBr + Ba(OH)2

Formula equation:

Net ionic :

1) Carbonates react with acids to form a salt, water and carbon dioxide gas. When 59.1 g of calcium carbonate are reacted with sufficient hydrochloric acid, how many grams of calcium chloride will be produced?

2) Write a balanced equation for the fermentation of glucose, C6H12O6, into ethyl alcohol, C2H5OH and CO2.

(Write in all coefficients, even if it's 1.)

C6H12O6 -> C2H5OH + CO2

Determine how many liters of ethyl alcohol (d= 0.789 g/mol) can be produced from 575 lb of glucose.

? L

Enter the formula for the compound formed between these elements:

(a) Al and P:

(b) H and Cl:

A 30.0-g piece of metal at 203oC is dropped into 200.0 g of water at 25.0 oC. The water temperature rises to 29.0 oC. Calculate the specific heat of the metal (J/goC). Assume that all of the heat lost by the metal is transferred to the water and no heat is lost to the surroundings.

The mass of an atom of silver is 1.79 × 10-22 g. How many atoms are in a 0.88 lb sample of silver? (Enter your answer in scientific notation as follows: 1.00E+2 is equivalent to 100).

The specific heat of a human is approximately 3.47 J/g°C.

a) If a 191 lb man eats a candy bar containing 273 Cal, how much will his body temperature increase if all of the calories from the candy bar are converted into heat energy? Remember that a food calorie (Cal) is equal to 1 kcal.

(b) If a 191 lb man eats a roll of candy containing 62.8 Cal, how much will his body temperature increase if all of the calories from the candy are converted into heat energy?

Naturally occurring zirconium exists as five stable isotopes: 90Zr with a mass of 89.905 amu (51.45%); 91Zr with a mass of 90.906 amu (11.22%); 92Zr with a mass of 91.905 amu (17.15%); 94Zr with a mass of 93.906 amu (17.38%), and 96Zr with a mass of 95.908 amu (2.80%). Calculate the average mass of zirconium.

A 155.0 g piece of copper at 175 oC is dropped into 250.0 g of water at 23.7 oC. (The specific heat of copper is 0.385 J/goC.) Calculate the final temperature of the mixture. (Assume no heat loss to the surroundings.)

I got 34oC as my answer I don't know if I'm doing something wrong in my math, but its driving me crazy not getting it

someone help, thanks!

3) A 100mL graduated cylinder is filled to 24.9mL with water and a balance. The balance reads 43.70g. An irregularly shaped metal object of unknown composition is placed in the graduated cylinder and the water level rises to 30.7 mL. The scale now reads 69.98g. Use a table of properties of some metals to mike the object.

help anyone!?

1) Platinum has a density of 21.45 g/mL. Gold has a density of 19.28 g/mL

(a) Which is larger, an 85 gram cube of platinum or an 5 gram cube of gold?

(b) What is the length of each side of an 85 gram cube of platinum? Remember that 1 cm^3 = 1 mL. Hint: Use the cube root.