Shine bright shine far

Popular questions and responses by Shine bright shine far
  1. Chemistry

    Confused What is the percent composition of chlorine in PCl5?

    asked on December 4, 2018
  2. Chemistry

    What is the mass of 50.0 L of O2(g) at STP? O is 16g/mole, so O2 is 32g/mole. 50/32 = 1.5625 moles. 1 mole of any gas at stp is 22.4 liters. 1.5625 × 22.4 = 35 liters.

    asked on February 21, 2019
  3. Chemistry

    check answer please 10. 2 Ca3(PO4)2(s) + 6 SiO2(g) + 10 C(s) ---> P4(s) + 6 CaSiO3(s) + 10 CO(g) If 39.3 g of Ca3(PO4)2, 24.4 g of SiO2 and 8.00g of C are available, find the limiting reagent. n Ca3(PO4)2= 0.127 moles n SiO2= 0.135 moles n C= 0.133 moles

    asked on March 3, 2019
  4. Chemistry

    P4O10(s) + 6 H2SO4(l) --> 4 H3PO4(aq) + 6 SO3(g) Pure H2SO4(l) has a density of 1.84 g/mL. If 45.0 mL of H2SO4(l) reacts: What mass of P4O10 reacts? - it's given 45.0 mL of H2SO4 with the density of 1.84 g/mL, so the mass of H2SO4 is 45*1.84 = 82.8 (g) so

    asked on March 3, 2019
  5. chemistry

    Zn + 2HCl ---> ZnCl2 + H2(g) What mass of zinc is needed to produce 115 mL of hydrogen? t's given 115 mL of hydrogen, so can convert to 115/1000/22,4 = 0.0051 moles H2 - the ratio between HCl and H2 is 2 : 1, so the moles of HCl needed for this reaction is

    asked on January 29, 2019
  6. chemistry

    P4O10(s) + 6 H2SO4(l)  4 H3PO4(aq) + 6 SO3(g) Pure H2SO4(l) has a density of 1.84 g/mL. If 45.0 mL of H2SO4(l) reacts: What mass of P4O10 reacts? 45.0 mL X 1.84 g/mL X (1 mol/98.1 g) = 0.844 mol H2SO4 Moles P4O10 = 0.844 mol H2SO4 X (1 mol P4O10 / 6 mol

    asked on March 5, 2019
  7. Chemistry

    Steven analyzed a compound and found it to be 52.7% Potassium and 47.3% Chlorine. He determined the empirical formula to be

    asked on December 4, 2018
  8. Chemistry

    2 KOH(l) + H3PO4(l) --> K2HPO4(l) + 2 H2O(l) a) How many mL of 0.450M KOH is needed to react with 60.0mL of 0.250M H3PO4? a) 0.060L x 0.250M = 0.015 mol H3PO4 0.015mol H3PO4 x 2mol KOH / 1mol H3PO4 = 0.03 mol KOH 0.03 mol KOH x 1L/0.450 mol = 0.06667L =

    asked on March 1, 2019
  9. chemistry

    KCl What is the molar mass (to the nearest tenth of a gram/mole) of each of the following 39.1 g/m + 35.5 g/m = 74.6 g/mol

    asked on February 25, 2019
  10. Chemistry

    N2(g) + 3H2(g)  2NH3(g) at STP How many litres of ammonia gas is produced using 5 litres of H2? 5L H2 x (2L NH3 / 3L H2) = 3.33L NH3 How many moles of N2 are needed? 5L H2 x (1L N2 / 3L H2) x (1 mol N2 / 22.41L N2@STP) = 0.0744 mole N2

    asked on March 5, 2019
  11. Chemistry

    is this right? Convert the following mass into moles (1 mark) 19.5 grams of Al(OH)3 27.0 + 3(16+1) = 78 19.5/78 = 0.25 moles

    asked on February 20, 2019
  12. Chemistry

    I did the question but I need help is this right? Thanks How many atoms of chlorine are in 19.0 grams of MgCl2? 24.3 + 2(35.5) = 95.3 19.0/95.3 x 6.022 x 1023 = 1.201 1023

    asked on December 3, 2018
  13. Chemistry

    Zn(s) + 2HCl(l) ---> ZnCl2(s) + H2(g) at STP What mass of zinc is needed to produce 115 mL of hydrogen? 0.115L/22.4L/mol = 0.0051 moles H2 gas 0.0051 mol x 65g/mol = 0.33 grams

    asked on March 4, 2019
  14. chemistry

    4. 2 C8H18(g) + 25 O2(g)  16 CO2(g) + 18 H2O­(g) at STP How many moles of O2 are needed to react with 60.0g of C8H18 (octane)? mole of 02 = 60/114 = 53 mols 2 moles of octane =25 mols of 02 0.53/2 x 25= 6.625 mols How many litres of CO2 are produced?

    asked on March 1, 2019
  15. chemistry

    Please check Complete the following reactions HNO3 + Sr(OH)2 --> C6H4(OH)2 + O2 --> my answers 2HNO3 + Sr(OH)2 --> Sr(NO3)2 + 2H2O 2C6H4(OH)2 + 13O2 --> 12CO2 + 6H2O

    asked on February 24, 2019
  16. Chemistry

    Zn + Ni(NO3)2--> AlCl3 + Na2CO3--> Al + O2 --> NO2 -->

    asked on February 24, 2019
  17. chemistry

    I need help I'm confused Complete the following reactions HNO3 + Sr(OH)2 ---->

    asked on February 24, 2019
  18. chemistry

    How many molecules are present in 1.5 moles of NaCl? na =23.0 cl=35.5 23.0 +35.5 = 58.5g 1.5mol x 58.5/1mol = 85.75

    asked on February 20, 2019
  19. chemistry

    Convert the following moles into masses 2.00 moles of N2 n=14g 2 x 14 =28 2.00mols x 28 = 56 mols

    asked on February 20, 2019
  1. Chemistry

    thank you!

    posted on March 5, 2019
  2. Chemistry

    Thank you !

    posted on March 3, 2019
  3. chemistry

    thanks

    posted on February 24, 2019
  4. chemistry

    Zn + Ni(NO3)2--> AlCl3 + Na2CO3--> Al + O2 --> NO2 --> please check these ones too thanks Zn + Ni(NO3)2--> Zn(NO3)2 + Ni AlCl3 + Na2CO3--> Al2(CO3)3 + 6NaCl Al + O2 --> 2 Al2O3 NO2 --> O2N

    posted on February 24, 2019
  5. Chemistry

    Zn + Ni(NO3)2--> Zn(NO3)2 + Ni AlCl3 + Na2CO3--> Al2(CO3)3 + 6NaCl Al + O2 --> 2 Al2O3 NO2 --> O2N

    posted on February 24, 2019
  6. Chemistry

    Zn(NO3)2 + Ni Al2(CO3)3 + 6NaCl 2 Al2O3 o2n

    posted on February 24, 2019
  7. chemistry

    2 H2O(l) + Sr(NO3)2

    posted on February 24, 2019
  8. Chemistry

    25.6

    posted on February 21, 2019
  9. Chemistry

    32 g/mol / 22.4 =1.42g/mol

    posted on February 21, 2019
  10. chemistry

    ok thanks !

    posted on February 20, 2019
  11. chemistry

    moles HCl needed = 2 x 0.0051 since stoichiometric ratio is 2:1 moles HCl = 0.01 moles

    posted on January 29, 2019
  12. chemistry

    confused by moles part

    posted on January 29, 2019
  13. Science

    0.30 mol / 4.00L = 0.075 mol/L ..

    posted on December 4, 2018
  14. Chemistry

    yes thank you Damon !!!

    posted on December 4, 2018
  15. Chemistry

    31.0 + 5(35.5) = 208.5 35.5 x 5= 177.5 177.5% 208.5 x 100% = 85%

    posted on December 4, 2018
  16. Chemistry

    1.20 x 10^23 formula units x 2 Cl atoms / formula unit = 2.40 x 10^23 Cl atoms.

    posted on December 3, 2018