GuideFoot - Learn Together, Grow Smarter. Logo

Questions in chemistry

📝 Answered - Consider this reaction. [tex]2 Mg(s)+O_2(g) \rightarrow 2 MgO(s)[/tex] What volume (in milliliters) of oxygen gas is required to react with 4.03 g of Mg at STP? A. 1960 mL B. 2880 mL C. 3710 mL D. [tex]45,100 mL[/tex]

📝 Answered - Consider this reaction: [tex]2 Mg(s)+O_2(g) \rightarrow 2 MgO(s)[/tex] What volume (in milliliters) of oxygen gas is required to react with 4.03 g of Mg at STP? A. 1860 mL B. 2880 mL C. 3710 mL D. [tex]45,100 dmL[/tex]

📝 Answered - The mass of two samples of copper were measured. What is the total mass, reported to the appropriate number of significant figures? [tex] \begin{array}{r} 1.6524 g \\ +\quad 5.67 g \\ \hline[?] g \end{array} [/tex]

📝 Answered - The mass of two samples of copper were measured. What is the total mass, reported to the appropriate number of significant figures? [tex] \begin{array}{l} 1.6524 g \\ + 5.67 g \\ \hline \end{array} [/tex]

📝 Answered - Which describes the volume of 1 mol of gas at standard temperature and pressure? The volume is greater for a larger mass of gas. The volume is the same for any gas. The volume depends on the size of the container. The volume varies with the pressure.

📝 Answered - Perform the following mathematical operation and report the answer to the correct number of significant figures. [tex]$0.0030 \times 8.65 = \square$[/tex]

📝 Answered - The volume of a gas is 0.450 L when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the pressure when its volume is changed to 2.00 L? Use [tex]P_1 V_1=P_2 V_2[/tex].

📝 Answered - Select the correct answer. Balance the following equation and determine the mole ratio of [tex]$Cl _2$[/tex] to [tex]$CCl _4$[/tex]. [tex]$CS _2+ Cl _2 \rightarrow CCl _4+ S _2 Cl _2$[/tex] A. 1.1 B. [tex]$2: 4$[/tex] C. [tex]$1: 2$[/tex] D. 3:1 E. [tex]$1: 3$[/tex]

📝 Answered - If 6.00 g of carbon is burned completely, what volume of carbon dioxide gas is released at STP? A. 6.0 L B. 11.2 L C. 22.4 L D. 134.4 L

📝 Answered - (d) An aqueous solution of [tex]$2000 cm^3$[/tex] contains 53.0 g of sodium trioxocarbonate (IV). Calculate the concentration in (i) [tex]$g / dm ^3$[/tex] (ii) [tex]$mol / dm ^3$[/tex] [ [tex]$Na =23, C =12, O =16$[/tex] ]