Shine bright shine far

This page lists questions and answers that were posted by visitors named Shine bright shine far.

Questions

The following questions were asked by visitors named Shine bright shine far.

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 i...

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

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

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

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.

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

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

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

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

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? 16...

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 = 6...

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...

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...

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

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

Answers

The following answers were posted by visitors named Shine bright shine far.

confused by moles part

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

32 g/mol / 22.4 =1.42g/mol

2 H2O(l) + Sr(NO3)2

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

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

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