# 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?

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.

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

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

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

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

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

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 =

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

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

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

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

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

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?

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

16. ## Chemistry

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

17. ## chemistry

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

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

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

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