Calculate the mass of dinitrogen tetroxide. (N2O4) that contains a million  (1.000x106 )oxygen atoms. Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

A major component of gasoline is octane (C,H,3). When liquid octane is burned in air it reacts with oxygen (O gas to produce carbon dioxide gas and water vapor. Calculate the moles of oxygen needed to produce 0.500 mol of water. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits. Ox10 Dlo 4

Ammonium phosophate ((NH4)3PO4) is an important ingredient in many solid fertilizers . It can be made by reactkng aqueous phosphoric acid (H3PO4) with liquid ammonia. Calculate the moles of ammonium phosphate produced by the reaction of 1.9 mol of ammonia. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose (C6H1206) and oxygen (0₂) gas. Calculate the moles of carbon dioxide needed to produce 1.20 mol of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits. I X x10 ロ･ロ

Ammonium phosphate NH43PO4 is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid H3PO4 with ammonia NH3 . What mass of ammonium phosphate is produced by the reaction of 2.07g  of phosphoric acid?   Be sure your answer has the correct number of significant digits.

CHEMISTRY Calculating Density Density is the compactness of matter. Density describes the quantity of matter (mass) per unit of volume (3-dimensional space). Density is calculated as the mass of the matter divided by volume. The symbol for density is Greek letter rho (p). The units for mass are in grams (g) and the units for volume is cubic centimeter (cm³). It should be noted that 1 cm³ is equal to 1 ml of volume. 1 cm³= 1 ml. The units for density are g/cm³. Part 1 Determine the density of the new liquid materials created in the Secret Density Research Laboratory. Type the value (no units) of the density into the boxes in the density column. Report density to the 2nd number after the decimal. Use a zero to the lef of the decimal for values less than 1.00. Examples: 2.35, 0.75, 1.90 Material name Harrisonite Waltonium Kellese Wheelernone Osborneum Popebrillium Mass (g) 430 590 260 m P=V 620 380 510 Volume (cm³) 537 454 236 364 633 340 Density (g/cm³) SAMSUNG

A chemist prepares a solution of mercury(I) chloride Hg2Cl2 by measuring out 0.0000526μmol of mercury(I) chloride into a 100 mL volumetric flask and filling the flask to the mark with water.Calculate the concentration of the chemist's mercury(I) chloride solution. Round your answer to 3 significant digits.

Calculate the mass of ammonia (NH;) that contains a trillion (1.0 × 102) hydrogen atoms. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits. ?

Calculate the mass of hydrazine (NH4) that contains a trillion (1.00 × 1012) hydrogen atoms. Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits. ☐ ☐ x10

A major component of gasoline is octane C8H18 . When liquid octane is burned in air it reacts with oxygen O2 gas to produce carbon dioxide gas and water vapor. Calculate the moles of oxygen needed to produce 0.085mol of water. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.